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skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Metà rootpage-Metà skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Vés al contingut</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Menú principal" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Menú principal</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Menú principal</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">amaga</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navegació </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Portada" title="Visiteu la pàgina principal [z]" accesskey="z"><span>Portada</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Especial:Article_aleatori" title="Carrega una pàgina a l’atzar [x]" accesskey="x"><span>Article a l'atzar</span></a></li><li id="n-Articles-de-qualitat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Articles_de_qualitat"><span>Articles de qualitat</span></a></li> </ul> </div> </div> <div id="p-Comunitat" class="vector-menu mw-portlet mw-portlet-Comunitat" > <div class="vector-menu-heading"> Comunitat </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-portal" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Portal" title="Sobre el projecte, què podeu fer, on trobareu les coses"><span>Portal viquipedista</span></a></li><li id="n-Agenda-d'actes" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Trobades"><span>Agenda d'actes</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Especial:Canvis_recents" title="Una llista dels canvis recents al wiki [r]" accesskey="r"><span>Canvis recents</span></a></li><li id="n-La-taverna" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:La_taverna"><span>La taverna</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Contacte"><span>Contacte</span></a></li><li id="n-Xat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Canals_IRC"><span>Xat</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Ajuda" title="El lloc per a saber més coses"><span>Ajuda</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Portada" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Viquipèdia" src="/static/images/mobile/copyright/wikipedia-wordmark-ca.svg" style="width: 7.5em; height: 1.4375em;"> <img class="mw-logo-tagline" alt="l'Enciclopèdia Lliure" src="/static/images/mobile/copyright/wikipedia-tagline-ca.svg" width="120" height="14" style="width: 7.5em; height: 0.875em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Especial:Cerca" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Cerca a la Viquipèdia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Cerca</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Cerca a Viquipèdia" aria-label="Cerca a Viquipèdia" autocapitalize="sentences" title="Cerca a la Viquipèdia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Especial:Cerca"> </div> <button class="cdx-button cdx-search-input__end-button">Cerca</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Eines personals"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparença" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Aparença</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca" class=""><span>Donatius</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Crea_compte&returnto=Met%C3%A0" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori" class=""><span>Crea un compte</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Met%C3%A0" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o" class=""><span>Inicia la sessió</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Més opcions" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Eines personals" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Eines personals</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Menú d'usuari" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca"><span>Donatius</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Crea_compte&returnto=Met%C3%A0" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Crea un compte</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Met%C3%A0" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Inicia la sessió</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pàgines per a editors no registrats <a href="/wiki/Ajuda:Introducci%C3%B3" aria-label="Vegeu més informació sobre l'edició"><span>més informació</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Especial:Contribucions_pr%C3%B2pies" title="Una llista de les modificacions fetes des d'aquesta adreça IP [y]" accesskey="y"><span>Contribucions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Especial:Discussi%C3%B3_personal" title="Discussió sobre les edicions per aquesta adreça ip. [n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contingut" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inici</div> </a> </li> <li id="toc-Propietats" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Propietats"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Propietats</span> </div> </a> <button aria-controls="toc-Propietats-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Commuta la subsecció Propietats</span> </button> <ul id="toc-Propietats-sublist" class="vector-toc-list"> <li id="toc-Riscos_potencials_sobre_la_salut" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Riscos_potencials_sobre_la_salut"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Riscos potencials sobre la salut</span> </div> </a> <ul id="toc-Riscos_potencials_sobre_la_salut-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Reaccions" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Reaccions"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Reaccions</span> </div> </a> <button aria-controls="toc-Reaccions-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Commuta la subsecció Reaccions</span> </button> <ul id="toc-Reaccions-sublist" class="vector-toc-list"> <li id="toc-Combustió" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Combustió"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Combustió</span> </div> </a> <ul id="toc-Combustió-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Reformació" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Reformació"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Reformació</span> </div> </a> <ul id="toc-Reformació-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Halogenació" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Halogenació"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Halogenació</span> </div> </a> <ul id="toc-Halogenació-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Usos" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Usos"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Usos</span> </div> </a> <button aria-controls="toc-Usos-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Commuta la subsecció Usos</span> </button> <ul id="toc-Usos-sublist" class="vector-toc-list"> <li id="toc-Combustible" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Combustible"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Combustible</span> </div> </a> <ul id="toc-Combustible-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Usos_industrials" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Usos_industrials"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Usos industrials</span> </div> </a> <ul id="toc-Usos_industrials-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Fonts" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Fonts"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Fonts</span> </div> </a> <ul id="toc-Fonts-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Metà_a_l'atmosfera_de_la_Terra" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Metà_a_l'atmosfera_de_la_Terra"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Metà a l'atmosfera de la Terra</span> </div> </a> <button aria-controls="toc-Metà_a_l'atmosfera_de_la_Terra-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Commuta la subsecció Metà a l'atmosfera de la Terra</span> </button> <ul id="toc-Metà_a_l'atmosfera_de_la_Terra-sublist" class="vector-toc-list"> <li id="toc-Emissions_de_metà" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Emissions_de_metà"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Emissions de metà</span> </div> </a> <ul id="toc-Emissions_de_metà-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Alliberament_sobtat_dels_clatrats_de_metà" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Alliberament_sobtat_dels_clatrats_de_metà"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2</span> <span>Alliberament sobtat dels clatrats de metà</span> </div> </a> <ul id="toc-Alliberament_sobtat_dels_clatrats_de_metà-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Emissió_de_metà_des_de_torberes_maltractades" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Emissió_de_metà_des_de_torberes_maltractades"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.3</span> <span>Emissió de metà des de torberes maltractades</span> </div> </a> <ul id="toc-Emissió_de_metà_des_de_torberes_maltractades-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Mecanismes_d'eliminació" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Mecanismes_d'eliminació"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.4</span> <span>Mecanismes d'eliminació</span> </div> </a> <ul id="toc-Mecanismes_d'eliminació-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-El_metà_a_Mart" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#El_metà_a_Mart"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>El metà a Mart</span> </div> </a> <ul id="toc-El_metà_a_Mart-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referències" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referències"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contingut" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Commuta la taula de continguts." > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Commuta la taula de continguts.</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Metà</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vés a un article en una altra llengua. Disponible en 115 llengües" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-115" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">115 llengües</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Metaan" title="Metaan - afrikaans" lang="af" hreflang="af" data-title="Metaan" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Metano" title="Metano - aragonès" lang="an" hreflang="an" data-title="Metano" data-language-autonym="Aragonés" data-language-local-name="aragonès" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D9%8A%D8%AB%D8%A7%D9%86" title="ميثان - àrab" lang="ar" hreflang="ar" data-title="ميثان" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Metanu" title="Metanu - asturià" lang="ast" hreflang="ast" data-title="Metanu" data-language-autonym="Asturianu" data-language-local-name="asturià" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Metan" title="Metan - azerbaidjanès" lang="az" hreflang="az" data-title="Metan" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaidjanès" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D9%85%D8%AA%D8%A7%D9%86" title="متان - South Azerbaijani" lang="azb" hreflang="azb" data-title="متان" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - baixkir" lang="ba" hreflang="ba" data-title="Метан" data-language-autonym="Башҡортса" data-language-local-name="baixkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Metano" title="Metano - Central Bikol" lang="bcl" hreflang="bcl" data-title="Metano" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - belarús" lang="be" hreflang="be" data-title="Метан" data-language-autonym="Беларуская" data-language-local-name="belarús" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%9C%D1%8D%D1%82%D0%B0%D0%BD" title="Мэтан - Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Мэтан" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - búlgar" lang="bg" hreflang="bg" data-title="Метан" data-language-autonym="Български" data-language-local-name="búlgar" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%AE%E0%A5%80%E0%A4%A5%E0%A5%87%E0%A4%A8" title="मीथेन - Bhojpuri" lang="bh" hreflang="bh" data-title="मीथेन" data-language-autonym="भोजपुरी" data-language-local-name="Bhojpuri" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-blk mw-list-item"><a href="https://blk.wikipedia.org/wiki/%E1%80%99%E1%80%AE%E1%80%9E%E1%80%AD%E1%80%94%E1%80%BA%E1%80%B8" title="မီသိန်း - Pa'O" lang="blk" hreflang="blk" data-title="မီသိန်း" data-language-autonym="ပအိုဝ်ႏဘာႏသာႏ" data-language-local-name="Pa'O" class="interlanguage-link-target"><span>ပအိုဝ်ႏဘာႏသာႏ</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AE%E0%A6%BF%E0%A6%A5%E0%A7%87%E0%A6%A8" title="মিথেন - bengalí" lang="bn" hreflang="bn" data-title="মিথেন" data-language-autonym="বাংলা" data-language-local-name="bengalí" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Metan" title="Metan - bretó" lang="br" hreflang="br" data-title="Metan" data-language-autonym="Brezhoneg" data-language-local-name="bretó" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs badge-Q17437798 badge-goodarticle mw-list-item" title="article bo"><a href="https://bs.wikipedia.org/wiki/Metan" title="Metan - bosnià" lang="bs" hreflang="bs" data-title="Metan" data-language-autonym="Bosanski" data-language-local-name="bosnià" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ceb mw-list-item"><a href="https://ceb.wikipedia.org/wiki/Metano" title="Metano - cebuà" lang="ceb" hreflang="ceb" data-title="Metano" data-language-autonym="Cebuano" data-language-local-name="cebuà" class="interlanguage-link-target"><span>Cebuano</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%85%DB%8C%D8%AA%D8%A7%D9%86" title="میتان - kurd central" lang="ckb" hreflang="ckb" data-title="میتان" data-language-autonym="کوردی" data-language-local-name="kurd central" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Methan" title="Methan - txec" lang="cs" hreflang="cs" data-title="Methan" data-language-autonym="Čeština" data-language-local-name="txec" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cu mw-list-item"><a href="https://cu.wikipedia.org/wiki/%D0%9C%D1%94%D1%B3%D0%B0%D0%BD%D1%8A" title="Мєѳанъ - eslau eclesiàstic" lang="cu" hreflang="cu" data-title="Мєѳанъ" data-language-autonym="Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ" data-language-local-name="eslau eclesiàstic" class="interlanguage-link-target"><span>Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Llosgnwy" title="Llosgnwy - gal·lès" lang="cy" hreflang="cy" data-title="Llosgnwy" data-language-autonym="Cymraeg" data-language-local-name="gal·lès" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Metan" title="Metan - danès" lang="da" hreflang="da" data-title="Metan" data-language-autonym="Dansk" data-language-local-name="danès" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de badge-Q17437796 badge-featuredarticle mw-list-item" title="article de qualitat"><a href="https://de.wikipedia.org/wiki/Methan" title="Methan - alemany" lang="de" hreflang="de" data-title="Methan" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9C%CE%B5%CE%B8%CE%AC%CE%BD%CE%B9%CE%BF" title="Μεθάνιο - grec" lang="el" hreflang="el" data-title="Μεθάνιο" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Methane" title="Methane - anglès" lang="en" hreflang="en" data-title="Methane" data-language-autonym="English" data-language-local-name="anglès" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Metano" title="Metano - esperanto" lang="eo" hreflang="eo" data-title="Metano" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Metano" title="Metano - espanyol" lang="es" hreflang="es" data-title="Metano" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Metaan" title="Metaan - estonià" lang="et" hreflang="et" data-title="Metaan" data-language-autonym="Eesti" data-language-local-name="estonià" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Metano" title="Metano - basc" lang="eu" hreflang="eu" data-title="Metano" data-language-autonym="Euskara" data-language-local-name="basc" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%85%D8%AA%D8%A7%D9%86" title="متان - persa" lang="fa" hreflang="fa" data-title="متان" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Metaani" title="Metaani - finès" lang="fi" hreflang="fi" data-title="Metaani" data-language-autonym="Suomi" data-language-local-name="finès" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/M%C3%A9thane" title="Méthane - francès" lang="fr" hreflang="fr" data-title="Méthane" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Metaan" title="Metaan - frisó septentrional" lang="frr" hreflang="frr" data-title="Metaan" data-language-autonym="Nordfriisk" data-language-local-name="frisó septentrional" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Meat%C3%A1n" title="Meatán - irlandès" lang="ga" hreflang="ga" data-title="Meatán" data-language-autonym="Gaeilge" data-language-local-name="irlandès" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Metano" title="Metano - gallec" lang="gl" hreflang="gl" data-title="Metano" data-language-autonym="Galego" data-language-local-name="gallec" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%AE%E0%AA%BF%E0%AA%A5%E0%AB%87%E0%AA%A8" title="મિથેન - gujarati" lang="gu" hreflang="gu" data-title="મિથેન" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-gv mw-list-item"><a href="https://gv.wikipedia.org/wiki/Meetane" title="Meetane - manx" lang="gv" hreflang="gv" data-title="Meetane" data-language-autonym="Gaelg" data-language-local-name="manx" class="interlanguage-link-target"><span>Gaelg</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/Methane" title="Methane - haussa" lang="ha" hreflang="ha" data-title="Methane" data-language-autonym="Hausa" data-language-local-name="haussa" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%AA%D7%90%D7%9F" title="מתאן - hebreu" lang="he" hreflang="he" data-title="מתאן" data-language-autonym="עברית" data-language-local-name="hebreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AE%E0%A4%BF%E0%A4%A5%E0%A5%87%E0%A4%A8" title="मिथेन - hindi" lang="hi" hreflang="hi" data-title="मिथेन" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Metan" title="Metan - croat" lang="hr" hreflang="hr" data-title="Metan" data-language-autonym="Hrvatski" data-language-local-name="croat" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Met%C3%A1n" title="Metán - hongarès" lang="hu" hreflang="hu" data-title="Metán" data-language-autonym="Magyar" data-language-local-name="hongarès" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%84%D5%A5%D5%A9%D5%A1%D5%B6" title="Մեթան - armeni" lang="hy" hreflang="hy" data-title="Մեթան" data-language-autonym="Հայերեն" data-language-local-name="armeni" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Metana" title="Metana - indonesi" lang="id" hreflang="id" data-title="Metana" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesi" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Metano" title="Metano - ido" lang="io" hreflang="io" data-title="Metano" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Metan" title="Metan - islandès" lang="is" hreflang="is" data-title="Metan" data-language-autonym="Íslenska" data-language-local-name="islandès" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Metano" title="Metano - italià" lang="it" hreflang="it" data-title="Metano" data-language-autonym="Italiano" data-language-local-name="italià" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%A1%E3%82%BF%E3%83%B3" title="メタン - japonès" lang="ja" hreflang="ja" data-title="メタン" data-language-autonym="日本語" data-language-local-name="japonès" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Metana" title="Metana - javanès" lang="jv" hreflang="jv" data-title="Metana" data-language-autonym="Jawa" data-language-local-name="javanès" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9B%E1%83%94%E1%83%97%E1%83%90%E1%83%9C%E1%83%98" title="მეთანი - georgià" lang="ka" hreflang="ka" data-title="მეთანი" data-language-autonym="ქართული" data-language-local-name="georgià" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Amitan" title="Amitan - cabilenc" lang="kab" hreflang="kab" data-title="Amitan" data-language-autonym="Taqbaylit" data-language-local-name="cabilenc" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - kazakh" lang="kk" hreflang="kk" data-title="Метан" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%AE%E0%B3%80%E0%B2%A5%E0%B3%87%E0%B2%A8%E0%B3%8D" title="ಮೀಥೇನ್ - kannada" lang="kn" hreflang="kn" data-title="ಮೀಥೇನ್" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%A9%94%ED%85%8C%EC%9D%B8" title="메테인 - coreà" lang="ko" hreflang="ko" data-title="메테인" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Metan" title="Metan - kurd" lang="ku" hreflang="ku" data-title="Metan" data-language-autonym="Kurdî" data-language-local-name="kurd" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - kirguís" lang="ky" hreflang="ky" data-title="Метан" data-language-autonym="Кыргызча" data-language-local-name="kirguís" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Methanum" title="Methanum - llatí" lang="la" hreflang="la" data-title="Methanum" data-language-autonym="Latina" data-language-local-name="llatí" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Methan" title="Methan - luxemburguès" lang="lb" hreflang="lb" data-title="Methan" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxemburguès" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Methaan" title="Methaan - limburguès" lang="li" hreflang="li" data-title="Methaan" data-language-autonym="Limburgs" data-language-local-name="limburguès" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lij mw-list-item"><a href="https://lij.wikipedia.org/wiki/Metano" title="Metano - lígur" lang="lij" hreflang="lij" data-title="Metano" data-language-autonym="Ligure" data-language-local-name="lígur" class="interlanguage-link-target"><span>Ligure</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Metan_(chimega)" title="Metan (chimega) - llombard" lang="lmo" hreflang="lmo" data-title="Metan (chimega)" data-language-autonym="Lombard" data-language-local-name="llombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Metanas" title="Metanas - lituà" lang="lt" hreflang="lt" data-title="Metanas" data-language-autonym="Lietuvių" data-language-local-name="lituà" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Met%C4%81ns" title="Metāns - letó" lang="lv" hreflang="lv" data-title="Metāns" data-language-autonym="Latviešu" data-language-local-name="letó" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - macedoni" lang="mk" hreflang="mk" data-title="Метан" data-language-autonym="Македонски" data-language-local-name="macedoni" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AE%E0%B5%80%E0%B4%A5%E0%B5%86%E0%B4%AF%E0%B5%8D%E0%B5%BB" title="മീഥെയ്ൻ - malaiàlam" lang="ml" hreflang="ml" data-title="മീഥെയ്ൻ" data-language-autonym="മലയാളം" data-language-local-name="malaiàlam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - mongol" lang="mn" hreflang="mn" data-title="Метан" data-language-autonym="Монгол" data-language-local-name="mongol" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AE%E0%A4%BF%E0%A4%A5%E0%A5%87%E0%A4%A8" title="मिथेन - marathi" lang="mr" hreflang="mr" data-title="मिथेन" data-language-autonym="मराठी" data-language-local-name="marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Metana" title="Metana - malai" lang="ms" hreflang="ms" data-title="Metana" data-language-autonym="Bahasa Melayu" data-language-local-name="malai" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%99%E1%80%AE%E1%80%9E%E1%80%AD%E1%80%94%E1%80%BA%E1%80%B8" title="မီသိန်း - birmà" lang="my" hreflang="my" data-title="မီသိန်း" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="birmà" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-myv mw-list-item"><a href="https://myv.wikipedia.org/wiki/%D0%92%D0%B5%D0%B4%D1%8C_%D1%82%D0%BE%D0%BB" title="Ведь тол - mordovià erza" lang="myv" hreflang="myv" data-title="Ведь тол" data-language-autonym="Эрзянь" data-language-local-name="mordovià erza" class="interlanguage-link-target"><span>Эрзянь</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Methan" title="Methan - baix alemany" lang="nds" hreflang="nds" data-title="Methan" data-language-autonym="Plattdüütsch" data-language-local-name="baix alemany" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%AE%E0%A4%BF%E0%A4%A5%E0%A5%87%E0%A4%A8" title="मिथेन - nepalès" lang="ne" hreflang="ne" data-title="मिथेन" data-language-autonym="नेपाली" data-language-local-name="nepalès" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Methaan" title="Methaan - neerlandès" lang="nl" hreflang="nl" data-title="Methaan" data-language-autonym="Nederlands" data-language-local-name="neerlandès" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Metan" title="Metan - noruec nynorsk" lang="nn" hreflang="nn" data-title="Metan" data-language-autonym="Norsk nynorsk" data-language-local-name="noruec nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Metan" title="Metan - noruec bokmål" lang="nb" hreflang="nb" data-title="Metan" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Metan" title="Metan - occità" lang="oc" hreflang="oc" data-title="Metan" data-language-autonym="Occitan" data-language-local-name="occità" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Mitteenii" title="Mitteenii - oromo" lang="om" hreflang="om" data-title="Mitteenii" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AE%E0%A9%80%E0%A8%A5%E0%A9%87%E0%A8%A8" title="ਮੀਥੇਨ - panjabi" lang="pa" hreflang="pa" data-title="ਮੀਥੇਨ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="panjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Metan" title="Metan - polonès" lang="pl" hreflang="pl" data-title="Metan" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Metan" title="Metan - piemontès" lang="pms" hreflang="pms" data-title="Metan" data-language-autonym="Piemontèis" data-language-local-name="piemontès" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D9%85%DB%8C%D8%AA%DA%BE%DB%8C%D9%86" title="میتھین - Western Punjabi" lang="pnb" hreflang="pnb" data-title="میتھین" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D9%85%DB%8C%D8%AA%D8%A7%D9%86" title="میتان - paixtu" lang="ps" hreflang="ps" data-title="میتان" data-language-autonym="پښتو" data-language-local-name="paixtu" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Metano" title="Metano - portuguès" lang="pt" hreflang="pt" data-title="Metano" data-language-autonym="Português" data-language-local-name="portuguès" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Metan" title="Metan - romanès" lang="ro" hreflang="ro" data-title="Metan" data-language-autonym="Română" data-language-local-name="romanès" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - rus" lang="ru" hreflang="ru" data-title="Метан" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - iacut" lang="sah" hreflang="sah" data-title="Метан" data-language-autonym="Саха тыла" data-language-local-name="iacut" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Mitanu" title="Mitanu - sicilià" lang="scn" hreflang="scn" data-title="Mitanu" data-language-autonym="Sicilianu" data-language-local-name="sicilià" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Metan" title="Metan - serbocroat" lang="sh" hreflang="sh" data-title="Metan" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbocroat" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Methane" title="Methane - Simple English" lang="en-simple" hreflang="en-simple" data-title="Methane" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Met%C3%A1n" title="Metán - eslovac" lang="sk" hreflang="sk" data-title="Metán" data-language-autonym="Slovenčina" data-language-local-name="eslovac" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Metan" title="Metan - eslovè" lang="sl" hreflang="sl" data-title="Metan" data-language-autonym="Slovenščina" data-language-local-name="eslovè" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Metani" title="Metani - albanès" lang="sq" hreflang="sq" data-title="Metani" data-language-autonym="Shqip" data-language-local-name="albanès" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - serbi" lang="sr" hreflang="sr" data-title="Метан" data-language-autonym="Српски / srpski" data-language-local-name="serbi" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-stq mw-list-item"><a href="https://stq.wikipedia.org/wiki/Methan" title="Methan - Saterland Frisian" lang="stq" hreflang="stq" data-title="Methan" data-language-autonym="Seeltersk" data-language-local-name="Saterland Frisian" class="interlanguage-link-target"><span>Seeltersk</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Metan" title="Metan - suec" lang="sv" hreflang="sv" data-title="Metan" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Methani" title="Methani - suahili" lang="sw" hreflang="sw" data-title="Methani" data-language-autonym="Kiswahili" data-language-local-name="suahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/Met%C5%AFn" title="Metůn - silesià" lang="szl" hreflang="szl" data-title="Metůn" data-language-autonym="Ślůnski" data-language-local-name="silesià" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AF%80%E0%AE%A4%E0%AF%8D%E0%AE%A4%E0%AF%87%E0%AE%A9%E0%AF%8D" title="மீத்தேன் - tàmil" lang="ta" hreflang="ta" data-title="மீத்தேன்" data-language-autonym="தமிழ்" data-language-local-name="tàmil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%AE%E0%B1%80%E0%B0%A5%E0%B1%87%E0%B0%A8%E0%B1%8D" title="మీథేన్ - telugu" lang="te" hreflang="te" data-title="మీథేన్" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - tadjik" lang="tg" hreflang="tg" data-title="Метан" data-language-autonym="Тоҷикӣ" data-language-local-name="tadjik" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A1%E0%B8%B5%E0%B9%80%E0%B8%97%E0%B8%99" title="มีเทน - tai" lang="th" hreflang="th" data-title="มีเทน" data-language-autonym="ไทย" data-language-local-name="tai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Metano" title="Metano - tagal" lang="tl" hreflang="tl" data-title="Metano" data-language-autonym="Tagalog" data-language-local-name="tagal" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Metan" title="Metan - turc" lang="tr" hreflang="tr" data-title="Metan" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/Metan" title="Metan - tàtar" lang="tt" hreflang="tt" data-title="Metan" data-language-autonym="Татарча / tatarça" data-language-local-name="tàtar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9C%D0%B5%D1%82%D0%B0%D0%BD" title="Метан - ucraïnès" lang="uk" hreflang="uk" data-title="Метан" data-language-autonym="Українська" data-language-local-name="ucraïnès" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D9%85%DB%8C%D8%AA%DA%BE%DB%8C%D9%86" title="میتھین - urdú" lang="ur" hreflang="ur" data-title="میتھین" data-language-autonym="اردو" data-language-local-name="urdú" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Metan" title="Metan - uzbek" lang="uz" hreflang="uz" data-title="Metan" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Methan" title="Methan - vietnamita" lang="vi" hreflang="vi" data-title="Methan" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Methane" title="Methane - waray" lang="war" hreflang="war" data-title="Methane" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E7%94%B2%E7%83%B7" title="甲烷 - xinès wu" lang="wuu" hreflang="wuu" data-title="甲烷" data-language-autonym="吴语" data-language-local-name="xinès wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/Methane" title="Methane - ioruba" lang="yo" hreflang="yo" data-title="Methane" data-language-autonym="Yorùbá" data-language-local-name="ioruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%94%B2%E7%83%B7" title="甲烷 - xinès" lang="zh" hreflang="zh" data-title="甲烷" data-language-autonym="中文" data-language-local-name="xinès" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E7%94%B2%E7%83%B7" title="甲烷 - xinès clàssic" lang="lzh" hreflang="lzh" data-title="甲烷" data-language-autonym="文言" data-language-local-name="xinès clàssic" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Methane" title="Methane - xinès min del sud" lang="nan" hreflang="nan" data-title="Methane" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="xinès min del sud" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E7%94%B2%E7%83%B7" title="甲烷 - cantonès" lang="yue" hreflang="yue" data-title="甲烷" data-language-autonym="粵語" data-language-local-name="cantonès" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q37129#sitelinks-wikipedia" title="Modifica enllaços interlingües" class="wbc-editpage">Modifica els enllaços</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Espais de noms"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Met%C3%A0" title="Vegeu el contingut de la pàgina [c]" accesskey="c"><span>Pàgina</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Discussi%C3%B3:Met%C3%A0" rel="discussion" title="Discussió sobre el contingut d'aquesta pàgina [t]" accesskey="t"><span>Discussió</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Canvia la variant de llengua" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">català</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Vistes"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Met%C3%A0"><span>Mostra</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Met%C3%A0&action=edit" title="Modifica el codi font d'aquesta pàgina [e]" accesskey="e"><span>Modifica</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Met%C3%A0&action=history" title="Versions antigues d'aquesta pàgina [h]" accesskey="h"><span>Mostra l'historial</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Eines de la pàgina"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Eines" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Eines</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Eines</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">amaga</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Més opcions" > <div class="vector-menu-heading"> Accions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Met%C3%A0"><span>Mostra</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Met%C3%A0&action=edit" title="Modifica el codi font d'aquesta pàgina [e]" accesskey="e"><span>Modifica</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Met%C3%A0&action=history"><span>Mostra l'historial</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Especial:Enlla%C3%A7os/Met%C3%A0" title="Una llista de totes les pàgines wiki que enllacen amb aquesta [j]" accesskey="j"><span>Què hi enllaça</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Especial:Seguiment/Met%C3%A0" rel="nofollow" title="Canvis recents a pàgines enllaçades des d'aquesta pàgina [k]" accesskey="k"><span>Canvis relacionats</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Especial:P%C3%A0gines_especials" title="Llista totes les pàgines especials [q]" accesskey="q"><span>Pàgines especials</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Met%C3%A0&oldid=34077444" title="Enllaç permanent a aquesta revisió de la pàgina"><span>Enllaç permanent</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Met%C3%A0&action=info" title="Més informació sobre aquesta pàgina"><span>Informació de la pàgina</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Especial:Citau&page=Met%C3%A0&id=34077444&wpFormIdentifier=titleform" title="Informació sobre com citar aquesta pàgina"><span>Citau aquest article</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Especial:UrlShortener&url=https%3A%2F%2Fca.wikipedia.org%2Fwiki%2FMet%25C3%25A0"><span>Obtén una URL abreujada</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Especial:QrCode&url=https%3A%2F%2Fca.wikipedia.org%2Fwiki%2FMet%25C3%25A0"><span>Descarrega el codi QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Imprimeix/exporta </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Especial:Llibre&bookcmd=book_creator&referer=Met%C3%A0"><span>Crea un llibre</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Especial:DownloadAsPdf&page=Met%C3%A0&action=show-download-screen"><span>Baixa com a PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Met%C3%A0&printable=yes" title="Versió per a impressió d'aquesta pàgina [p]" accesskey="p"><span>Versió per a impressora</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> En altres projectes </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Methane" hreflang="en"><span>Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q37129" title="Enllaç a l'element del repositori de dades connectat [g]" accesskey="g"><span>Element a Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Eines de la pàgina"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aparença</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">amaga</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">De la Viquipèdia, l'enciclopèdia lliure</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ca" dir="ltr"><table class="infobox" style="font-size:90%;width:25em"><caption style="font-weight:bold;color: #202122; background-color: #b0d1ad;"><span style="float:left;"><span class="skin-invert" typeof="mw:File"><a href="/wiki/Fitxer:Test_tube_icon.svg" class="mw-file-description" title="Infotaula de compost químic"><img alt="Infotaula de compost químic" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Test_tube_icon.svg/22px-Test_tube_icon.svg.png" decoding="async" width="22" height="21" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Test_tube_icon.svg/33px-Test_tube_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/be/Test_tube_icon.svg/44px-Test_tube_icon.svg.png 2x" data-file-width="512" data-file-height="481" /></a></span></span>Metà</caption><tbody><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><span typeof="mw:File"><a href="/w/index.php?title=Fitxer:Methane-3D-space-filling.svg&lang=ca" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Methane-3D-space-filling.svg/langca-275px-Methane-3D-space-filling.svg.png" decoding="async" width="275" height="300" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Methane-3D-space-filling.svg/langca-413px-Methane-3D-space-filling.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Methane-3D-space-filling.svg/langca-550px-Methane-3D-space-filling.svg.png 2x" data-file-width="1009" data-file-height="1100" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Substància química</th><td class="infobox-data"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q113145171" class="extiw" title="d:Special:EntityPage/Q113145171">tipus d'entitat química</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P31" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Massa molecular</th><td class="infobox-data">16,031 Da <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2067" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Descobridor o inventor</th><td class="infobox-data"><a href="/wiki/Alessandro_Volta" title="Alessandro Volta">Alessandro Volta</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P61" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Data de descobriment o invenció</th><td class="infobox-data">1777 <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P575" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Trobat en el tàxon</th><td class="infobox-data"><div class="mw-collapsible mw-collapsed" style="border:none; padding: 0;"><div class="" style="width:100%;" align="left"></div><div class="mw-collapsible-content" style="text-align:left;"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3461459" class="extiw" title="d:Special:EntityPage/Q3461459">Callyspongia</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3463351" class="extiw" title="d:Special:EntityPage/Q3463351">Callyspongia truncata</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2430973" class="extiw" title="d:Special:EntityPage/Q2430973">Petrosia ficiformis</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q4116306" class="extiw" title="d:Special:EntityPage/Q4116306">Petrosia</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2149097" class="extiw" title="d:Special:EntityPage/Q2149097">Petrosia durissima</a>, <a href="/wiki/Olivarda" title="Olivarda">olivarda</a>, <a href="/wiki/Aspergillus" title="Aspergillus">Aspergillus</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1557130" class="extiw" title="d:Special:EntityPage/Q1557130">Mandragora turcomanica</a>, <a href="/wiki/Mandragora_officinarum" title="Mandragora officinarum">Mandragora autumnalis</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q150991" class="extiw" title="d:Special:EntityPage/Q150991">Stangeria eriopus</a>, <a href="/wiki/Ciques" title="Ciques">Ciques</a>, <a href="/wiki/Palma_zamia" title="Palma zamia">palma zamia</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1062866" class="extiw" title="d:Special:EntityPage/Q1062866">Dioon spinulosum</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q5402509" class="extiw" title="d:Special:EntityPage/Q5402509">Macrozamia communis</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q522204" class="extiw" title="d:Special:EntityPage/Q522204">Cycas media</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q845714" class="extiw" title="d:Special:EntityPage/Q845714">Ceratozamia mexicana</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q924592" class="extiw" title="d:Special:EntityPage/Q924592">Zamia furfuracea</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3060343" class="extiw" title="d:Special:EntityPage/Q3060343">Eumaeus atala</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q3506489" class="extiw" title="d:Special:EntityPage/Q3506489">Zamia integrifolia</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1519478" class="extiw" title="d:Special:EntityPage/Q1519478">Datura inoxia</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q17464343" class="extiw" title="d:Special:EntityPage/Q17464343">Datura innoxia</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q4115561" class="extiw" title="d:Special:EntityPage/Q4115561">Datura discolor</a>, <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q15582533" class="extiw" title="d:Special:EntityPage/Q15582533">Elephantopus elatus</a>, <a href="/wiki/Fragaria" title="Fragaria">Fragaria</a> i <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q22287073" class="extiw" title="d:Special:EntityPage/Q22287073">Streptomyces catenulae</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P703" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span> </div></div></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Rol</th><td class="infobox-data"><a href="/wiki/Gas_amb_efecte_d%27hivernacle" title="Gas amb efecte d'hivernacle">gas hivernacle</a> i <a href="/wiki/Agent_reductor" title="Agent reductor">reductor</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2868" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;color: #202122; background-color: #b0d1ad;">Estructura química</th></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Fórmula química</th><td class="infobox-data"><big>CH₄</big> <span class="penicon" data-bridge-edit-flow="single-best-value"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P274" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><span typeof="mw:File"><a href="/w/index.php?title=Fitxer:Methan_Keilstrich.svg&lang=ca" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Methan_Keilstrich.svg/langca-285px-Methan_Keilstrich.svg.png" decoding="async" width="285" height="300" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Methan_Keilstrich.svg/langca-428px-Methan_Keilstrich.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Methan_Keilstrich.svg/langca-570px-Methan_Keilstrich.svg.png 2x" data-file-width="96" data-file-height="101" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;"><a href="https://www.wikidata.org/wiki/Special:EntityPage/P233" class="extiw" title="d:Special:EntityPage/P233">SMILES canònic</a></th><td class="infobox-data"><div class="mw-collapsible mw-collapsed" style="border:none; padding: 0;"><div class="" style="width:100%;" align="left"></div><div class="mw-collapsible-content" style="text-align:left;"> <a rel="nofollow" class="external text" href="http://cdkdepict-openchem.rhcloud.com/depict/bow/svg?smi=%241&zoom=2.0&annotate=none">Model 2D</a><br />C <span class="penicon" data-bridge-edit-flow="single-best-value"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P233" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span> </div></div></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;"><a href="https://www.wikidata.org/wiki/Special:EntityPage/P234" class="extiw" title="d:Special:EntityPage/P234">Identificador InChI</a></th><td class="infobox-data"><a rel="nofollow" class="external text" href="http://chemapps.stolaf.edu/jmol/jmol.php?&model=InChI=InChI=1S/CH4/h1H4">Model 3D</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P234" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;color: #202122; background-color: #b0d1ad;">Propietat</th></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Densitat</th><td class="infobox-data">0,717 kg/m³ (a 0 °C, <a href="/wiki/Gas" title="Gas">gas</a>)<br />422,36 kg/m³ (a −161,6 °C, <a href="/wiki/L%C3%ADquid" title="Líquid">líquid</a>) <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2054" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Velocitat del so</th><td class="infobox-data">1.337 m/s (−161,5 °C, <a href="/wiki/L%C3%ADquid" title="Líquid">líquid</a>)<br />450 m/s (27 °C, <a href="/wiki/Gas" title="Gas">gas</a>) <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2075" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Moment dipolar elèctric</th><td class="infobox-data">0 D <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2201" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Punt de fusió</th><td class="infobox-data">−182,49 °C <br />−182,46 °C <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2101" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Punt d'ebullició</th><td class="infobox-data">111,4 K (a 1 atm)<br />−161 °C (a 101 Pa)<br />−161,48 °C (a 101,325 kPa) <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2102" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Entropia molar estàndard</th><td class="infobox-data">186,3 J/(mol K) <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P3071" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Moment dipolar elèctric</th><td class="infobox-data">0 D <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2201" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Entalpia estàndard de formació</th><td class="infobox-data">−74.520 J/mol <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P3078" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Entalpia de combustió</th><td class="infobox-data">−890,3 kJ/mol <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2117" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;color: #202122; background-color: #b0d1ad;">Perill</th></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Temperatura d'autoignició</th><td class="infobox-data">537,8 °C <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2199" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;color: #202122; background-color: #eeeeee; width: 40%;">Potencial d'escalfament global</th><td class="infobox-data">28 i 84 <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P2565" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q51139288" class="extiw" title="d:Special:EntityPage/Q51139288">NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response</a> () <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P4952" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;color: #202122; background-color: #b0d1ad;">Altres</th></tr><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q11567495" class="extiw" title="d:Special:EntityPage/Q11567495">incolor</a> i <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q30007162" class="extiw" title="d:Special:EntityPage/Q30007162">inodor</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P1552" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr></tbody></table> <p>El <b>metà</b> és un <a href="/wiki/Hidrocarbur" title="Hidrocarbur">hidrocarbur</a> saturat, el més senzill de la sèrie dels <a href="/wiki/Alc%C3%A0" title="Alcà">alcans</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> La seva fórmula química és <a href="/wiki/Carboni" title="Carboni">C</a><a href="/wiki/Hidrogen" title="Hidrogen">H</a>₄. Cadascun dels àtoms d'<a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a> s'uneix al <a href="/wiki/Carboni" title="Carboni">carboni</a> per mitjà d'un <a href="/wiki/Enlla%C3%A7_covalent" title="Enllaç covalent">enllaç covalent</a>. És una substància no polar que es presenta en forma de <a href="/wiki/Gas" title="Gas">gas</a> a temperatures i pressions ordinàries. És incolor i no gaire soluble en <a href="/wiki/Aigua" title="Aigua">aigua</a> en la seva fase líquida. </p><p>A la natura es produeix com a producte final de la descomposició anaeròbica de la matèria orgànica. Molts <a href="/wiki/Microorganismes" class="mw-redirect" title="Microorganismes">microorganismes</a> anaeròbics el generen utilitzant el CO₂ com a acceptor final d'electrons. </p><p>Constitueix fins al 97% del <a href="/wiki/Gas_natural" title="Gas natural">gas natural</a>. A les mines de <a href="/wiki/Carb%C3%B3" title="Carbó">carbó</a> se l'anomena <a href="/wiki/Gris%C3%BA" title="Grisú">grisú</a> i és molt perillós, ja que és fàcilment inflamable i explosiu.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>El metà és un <a href="/wiki/Gas_amb_efecte_d%27hivernacle" title="Gas amb efecte d'hivernacle">gas amb efecte d'hivernacle</a> relativament potent que contribueix a l'<a href="/wiki/Escalfament_global" title="Escalfament global">escalfament global</a> del planeta <a href="/wiki/Terra" title="Terra">Terra</a>, ja que té un <a href="/wiki/Potencial_d%27escalfament_global" title="Potencial d'escalfament global">potencial d'escalfament global</a> de 23.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Això significa que en una mitjana de temps de 100 anys cada kg de CH₄ escalfa la Terra 23 vegades més que la mateixa massa de CO₂, tanmateix hi ha aproximadament 220 vegades més <a href="/wiki/Di%C3%B2xid_de_carboni" title="Diòxid de carboni">diòxid de carboni</a> a l'atmosfera de la Terra que metà per la qual cosa el metà contribueix de manera menys important a l'<a href="/wiki/Efecte_d%27hivernacle" title="Efecte d'hivernacle">efecte d'hivernacle</a>. </p><p>Si el metà es controla i no se'l deixa escapar a l'atmosfera, pot ser un gas útil per emmagatzemar energia neta en utilitzar, per exemple, l'electricitat excedentària de les aerogeneradores per produir metà, l'anomenada <a href="/wiki/Conversi%C3%B3_d%27electricitat_en_gas" title="Conversió d'electricitat en gas">conversió d'electricitat en gas</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Propietats">Propietats</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=1" title="Modifica la secció: Propietats"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El metà és el component majoritari del gas natural, aproximadament un 97% en volum a <a href="/wiki/Temperatura_ambient" title="Temperatura ambient">temperatura ambient</a> i pressió estàndard, el metà és un gas incolor i inodor. Com a mesura de seguretat s'hi afegeix un odorant, habitualment <a href="/wiki/Metanotiol" title="Metanotiol">metanotiol</a> o <a href="/wiki/Etanotiol" title="Etanotiol">etanotiol</a>. el metà té un punt de fusió de -183 °C. a una atmosfera i un <a href="/wiki/Punt_d%27ebullici%C3%B3" title="Punt d'ebullició">punt d'ebullició</a> de -161,5<a href="/wiki/Grau_Celsius" title="Grau Celsius">°C</a>. Com a gas és només inflamable en un estret interval de concentracions a l'aire (5-15%). El metà líquid no és combustible. </p> <div class="mw-heading mw-heading3"><h3 id="Riscos_potencials_sobre_la_salut">Riscos potencials sobre la salut</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=2" title="Modifica la secció: Riscos potencials sobre la salut"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El metà no és tòxic. El seu principal perill per a la salut són les cremades que pot provocar si entra en ignició. És altament inflamable i pot formar barreges explosives amb l'aire. El metà reacciona violentament amb oxidants, halògens i alguns compostos halogenats. El metà és també un asfixiant i pot desplaçar l'oxigen en un espai tancat. L'asfixia pot sobrevindré si la concentració d'oxigen és reduïda per sota el 19,5% per desplaçament. Les concentracions a les quals es formen les barreges explosives o inflamables són molt més petites que les concentracions a les quals el risc d'asfíxia és significatiu. Si hi ha estructures construïdes al damunt o a prop d'abocadors, el meta després pot penetrar a l'interior dels edificis i exposar els ocupants a nivells significatius de metà. Alguns edificis tenen sistemes per sota els seus fonaments per capturar aquest gas i expulsar-lo de l'edifici. Un exemple d'aquest tipus de sistema es troba en l'<a href="/w/index.php?title=Edifici_Dakin&action=edit&redlink=1" class="new" title="Edifici Dakin (encara no existeix)">edifici Dakin</a>, <a href="/wiki/Brisbane" title="Brisbane">Brisbane</a>, <a href="/wiki/Calif%C3%B2rnia" title="Califòrnia">Califòrnia</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Reaccions">Reaccions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=3" title="Modifica la secció: Reaccions"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Les principals reaccions del metà són: <a href="/wiki/Combusti%C3%B3" title="Combustió">combustió</a>, <a href="/wiki/Reformaci%C3%B3_amb_vapor" title="Reformació amb vapor">reformació amb vapor</a> (<i>steam reforming</i>) per donar <a href="/wiki/Gas_de_s%C3%ADntesi" title="Gas de síntesi">gas de síntesi</a> (<i>syngas</i>), i <a href="/wiki/Halogenaci%C3%B3" title="Halogenació">halogenació</a>. En general, les reaccions del metà són dificultoses de controlar. Per exemple, l'oxidació parcials fins a metanol és difícil d'aconseguir; la reacció normalment segueix fins a donar diòxid de carboni i aigua. </p> <div class="mw-heading mw-heading3"><h3 id="Combustió"><span id="Combusti.C3.B3"></span>Combustió</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=4" title="Modifica la secció: Combustió"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>En la combustió del metà hi ha involucrats una sèrie de passos: Es creu que el metà reacciona en primer lloc amb l'oxigen per formar <a href="/wiki/Formaldehid" title="Formaldehid">formaldehid</a> (HCHO or <span class="chemf" style="white-space:nowrap;">H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>CO</span>). Tot seguit el formaldehid es descompon en el radical <a href="/wiki/Formil" class="mw-redirect" title="Formil">formil</a>, el qual a continuació dona <a href="/wiki/Mon%C3%B2xid_de_carboni" title="Monòxid de carboni">monòxid de carboni</a> i <a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a>. Aquest procés és conegut en el seu conjunt com <a href="/wiki/Pir%C3%B2lisi" title="Piròlisi">piròlisi</a> oxidativa. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span> + O<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span> → CO + H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span> + H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O</span></dd></dl> <p>Seguint la pirolisis oxidativa, l'<span class="chemf" style="white-space:nowrap;">H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span></span> s'oxida formant <span class="chemf" style="white-space:nowrap;">H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O</span>, reomplint les espècies actives i desprenent calor. Aquest procés és molt ràpid, sent la seva durada habitual inferior a un mil·lisegon. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">2H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span> + O<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span> →2H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O</span></dd></dl> <p>Finalment el CO s'oxida, formant <span class="chemf" style="white-space:nowrap;">CO<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span></span> i alliberant més calor. Aquest procés és generalment més lent que la resta de passos, i requereix uns quants mil·lisegons per produir-se. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">2CO + O<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span> →2CO<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span></span></dd></dl> <div class="mw-heading mw-heading3"><h3 id="Reformació"><span id="Reformaci.C3.B3"></span>Reformació</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=5" title="Modifica la secció: Reformació"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La força de l'<a href="/wiki/Enlla%C3%A7_covalent" title="Enllaç covalent">enllaç covalent</a> <a href="/wiki/Carboni" title="Carboni">carboni</a>-<a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a> es troba entre els més forts de tots els hidrocarburs, i per tant el seu ús com a primera matèria és limitat. Malgrat l'alta energia d'activació per trencar l'enllaç C-H, el metà es encara el principal material de partida per fabricar <a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a> mitjançant <a href="/w/index.php?title=Reformaci%C3%B3&action=edit&redlink=1" class="new" title="Reformació (encara no existeix)">reformació</a> amb vapor. La recerca de <a href="/wiki/Catalitzadors" class="mw-redirect" title="Catalitzadors">catalitzadors</a> que puguin facilitar l'activació de l'enllaç C-H en el metà i altres <a href="/wiki/Alc%C3%A0" title="Alcà">alcans</a> lleugers és una àrea d'investigació de gran importància industrial. </p> <div class="mw-heading mw-heading3"><h3 id="Halogenació"><span id="Halogenaci.C3.B3"></span>Halogenació</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=6" title="Modifica la secció: Halogenació"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El metà reacciona amb els halògens sota condicions adequades. La reacció té lloc de la següent manera. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span> + X<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span> → CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />3</span>X + HX</span></dd></dl> <p>A on X és un halogen: <a href="/wiki/Fluor" title="Fluor">fluor</a> (F), <a href="/wiki/Clor" title="Clor">Clor</a> (Cl), <a href="/wiki/Brom" title="Brom">Brom</a> (Br) i a vegades <a href="/wiki/Iode" title="Iode">Iode</a> (I). El mecanisme d'aquesta reacció és el d'<a href="/w/index.php?title=Halogenaci%C3%B3_per_radicals_lliures&action=edit&redlink=1" class="new" title="Halogenació per radicals lliures (encara no existeix)">halogenació per radicals lliures</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Usos">Usos</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=7" title="Modifica la secció: Usos"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Combustible">Combustible</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=8" title="Modifica la secció: Combustible"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><i>Per a més informació de l'ús del metà com a combustible, consulteu: <a href="/wiki/Gas_natural" title="Gas natural">gas natural</a>.</i> </p><p>El metà és important per a la <a href="/wiki/Generaci%C3%B3_el%C3%A8ctrica" class="mw-redirect" title="Generació elèctrica">generació elèctrica</a>, ja que s'empra com a combustible en les <a href="/w/index.php?title=Turbines_de_gas&action=edit&redlink=1" class="new" title="Turbines de gas (encara no existeix)">turbines de gas</a> o en els <a href="/w/index.php?title=Generadors_de_vapor&action=edit&redlink=1" class="new" title="Generadors de vapor (encara no existeix)">generadors de vapor</a>. Si bé el seu calor de combustió, d'uns 802 kJ/mol, és el més petit de tots els hidrocarburs, si es divideix per la seva massa molecular (16 g/mol) es troba que el metà, el més simple dels hidrocarburs, produeix més quantitat de calor per unitat de massa que altres hidrocarburs més complexos. En moltes ciutats, el metà es transporta en canonades fins a les cases per a ser emprat com a combustible per a la <a href="/wiki/Calefacci%C3%B3" class="mw-redirect" title="Calefacció">calefacció</a> i per cuinar. En aquest context se l'anomena <a href="/wiki/Gas_natural" title="Gas natural">gas natural</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Usos_industrials">Usos industrials</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=9" title="Modifica la secció: Usos industrials"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El metà és emprat en processos químics industrials i pot ser transportat com a líquid refrigerat (gas natural liquat, or <a href="/wiki/GNL" class="mw-redirect" title="GNL">GNL</a>). Mentre que les fuites d'un contenidor refrigerat són inicialment més pesants que l'aire a causa de l'alta densitat del gas fred, a temperatura ambient el gas és més lleuger que l'aire. Els <a href="/wiki/Gasoducte" title="Gasoducte">gasoductes</a> transporten grans quantitats de <a href="/wiki/Gas_natural" title="Gas natural">gas natural</a>, del qual el metà és el principal component. A la indústria química, el metà és la <a href="/wiki/Primeres_mat%C3%A8ries" title="Primeres matèries">primera matèria </a> elegida per a la producció d'<a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a>, <a href="/wiki/Metanol" title="Metanol">metanol</a>, <a href="/wiki/%C3%80cid_ac%C3%A8tic" title="Àcid acètic">àcid acètic</a> i <a href="/w/index.php?title=Anhidre_ac%C3%A8tic&action=edit&redlink=1" class="new" title="Anhidre acètic (encara no existeix)">anhidre acètic</a>. Quan s'empra per a produir qualsevol d'aquests productes químics, el metà es transforma primer en <a href="/wiki/Gas_de_s%C3%ADntesi" title="Gas de síntesi">gas de síntesi</a>, una barreja de <a href="/wiki/Mon%C3%B2xid_de_carboni" title="Monòxid de carboni">monòxid de carboni</a> i <a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a>, mitjançant reformació per vapor. En aquest procés, el metà i el <a href="/wiki/Vapor" title="Vapor">vapor</a> reaccionen amb l'ajuda d'un catalitzador de <a href="/wiki/N%C3%ADquel" title="Níquel">níquel</a> a altes temperatures (700 -1100 °C) </p> <dl><dd><span class="chemf" style="white-space:nowrap;">CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span>+ H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O → CO + 3H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span></span></dd></dl> <p>La proporció de monòxid de carboni enfront de l'hidrogen pot ser ajustada mitjançant la <a href="/w/index.php?title=Reacci%C3%B3_de_despla%C3%A7ament_de_gas_d%27aigua&action=edit&redlink=1" class="new" title="Reacció de desplaçament de gas d'aigua (encara no existeix)">reacció de desplaçament de gas d'aigua</a> al valor desitjat. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">CO + H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O → CO<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>+ H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span></span></dd></dl> <p>Altres productes químics menys importants derivats del metà inclouen l'<a href="/wiki/Acetil%C3%A8" title="Acetilè">acetilè</a> obtingut fent passar metà a través d'un <a href="/wiki/Arc_el%C3%A8ctric" title="Arc elèctric">arc elèctric</a>, i els clorometans (<a href="/wiki/Cloromet%C3%A0" title="Clorometà">clorometà</a>, <a href="/wiki/Dicloromet%C3%A0" title="Diclorometà">diclorometà</a>, <a href="/wiki/Cloroform" title="Cloroform">cloroform</a>, y <a href="/wiki/Tetraclorur_de_carboni" title="Tetraclorur de carboni">tetraclorur de carboni</a>), produïts per mitjà de la recció del metà amb gas de <a href="/wiki/Clor" title="Clor">clor</a>. Tanmateix, l'ús d'aquests productes està disminuint, l'acetilè essent reemplaçat per substituts més econòmics i els clorometans degut a motius de salut i mediambientals. </p> <div class="mw-heading mw-heading2"><h2 id="Fonts">Fonts</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=10" title="Modifica la secció: Fonts"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Una major font de metà és la seva extracció dels dipòsits geològics coneguts com a camps de gas natural. Es troba associat a altres <a href="/wiki/Hidrocarburs" class="mw-redirect" title="Hidrocarburs">hidrocarburs</a> combustibles i a vegades acompanyat per <a href="/wiki/Heli" title="Heli">heli</a> i <a href="/wiki/Nitrogen" title="Nitrogen">nitrogen</a>. El gas, especialment si està situat en formacions poc profundes (baixa pressió), es forma per la <a href="/wiki/Putrefacci%C3%B3" title="Putrefacció">putrefacció</a> <a href="/wiki/Anaer%C3%B2bica" class="mw-redirect" title="Anaeròbica">anaeròbica</a> de <a href="/wiki/Mat%C3%A8ria_org%C3%A0nica" title="Matèria orgànica">matèria orgànica</a> i la resta es creu que prové de la lenta desgasificació del materials primordials situats a les parts més profundes del planeta. En termes generals, els dipòsits de gas es generen en sediments enterrats a major profunditat i més altes temperatures que els que donen lloc al <a href="/wiki/Petroli" title="Petroli">petroli</a>. </p><p>També es pot extreure metà dels dipòsits de carbó (CMB són les seves sigles en anglès) mitjançant la perforació de pous en les capes de <a href="/wiki/Carb%C3%B3" title="Carbó">carbó</a>, bombant a continuació l'aigua de la veta per produir una despressurització la qual cosa permet la desabsorció del metà i la seva pujada pel pou fins a la superfície. Amb aquesta tècnica es produeix el 7% del gas natural dels <a href="/wiki/Estats_Units" class="mw-redirect" title="Estats Units">Estats Units</a>, si bé pot haver-hi problemes mediambientals degut a la baixada del nivell dels <a href="/wiki/Aq%C3%BC%C3%ADfers" class="mw-redirect" title="Aqüífers">aqüífers</a> i a la presència de contaminants en l'aigua extreta. Els hidrats de metà, o <a href="/wiki/Clatrat" title="Clatrat">clatrats</a> (combinacions de gel i metà en el fons marí) són una futura font potencial de metà, si bé fins ara no n'existeix cap explotació comercial. </p><p>A més dels camps de <a href="/wiki/Gas_natural" title="Gas natural">gas natural</a> una forma alternativa per obtenir metà és mitjançant el <a href="/wiki/Biog%C3%A0s" title="Biogàs">biogàs</a> generat per la <a href="/wiki/Fermentaci%C3%B3" title="Fermentació">fermentació</a> de la <a href="/wiki/Mat%C3%A8ria_org%C3%A0nica" title="Matèria orgànica">matèria orgànica</a> que es troba en els <a href="/wiki/Fem" title="Fem">fems</a>, en els llots de les aigües residuals, en la brossa domestica, o altres primeres matèries biodegradables, sota condicions <a href="/wiki/Anaer%C3%B2bic" class="mw-redirect" title="Anaeròbic">anaeròbiques</a>. El metà també es pot produir industrialment emprant com a matèries primeres l'<a href="/wiki/Hidrogen" title="Hidrogen">hidrogen</a> (el qual es pot obtenir mitjançant <a href="/wiki/Electr%C3%B2lisi" title="Electròlisi">electròlisi</a>) i el <a href="/wiki/Di%C3%B2xid_de_carboni" title="Diòxid de carboni">diòxid de carboni</a> mitjançant el <a href="/wiki/Proc%C3%A9s_Sabatier" class="mw-redirect" title="Procés Sabatier">procés Sabatier</a>. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">CO<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>+ 4H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>→ CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span>+ 2H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O</span></dd></dl> <p>La <a href="/wiki/Ramaderia_bovina" title="Ramaderia bovina">ramaderia</a> intensiva és una font important de metà.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Totes les espècies n'emeten, però la producció de gas dels <a href="/wiki/Remugants" title="Remugants">remugants</a> és llargament superior. Per exemple, a Argentina la ramaderia —el país comptava el 2008 amb 55 millions de vaques— és responsable de 30% de les emissions de gasos amb efecte d'hivernacle.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Metà_a_l'atmosfera_de_la_Terra"><span id="Met.C3.A0_a_l.27atmosfera_de_la_Terra"></span>Metà a l'atmosfera de la Terra</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=11" title="Modifica la secció: Metà a l'atmosfera de la Terra"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:Ch4_color_superficie.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Ch4_color_superficie.png/220px-Ch4_color_superficie.png" decoding="async" width="220" height="174" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Ch4_color_superficie.png/330px-Ch4_color_superficie.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/24/Ch4_color_superficie.png/440px-Ch4_color_superficie.png 2x" data-file-width="650" data-file-height="514" /></a><figcaption>Gràfic concentració metà</figcaption></figure> <p>El metà és un gas d'hivernacle molt important a l'atmosfera de la Terra amb un potencial d'escalfament de 23 per centenari. Això implica que l'emissió d'una tona de meta tindrà 23 vegades l'impacte de l'emissió d'una tona de diòxid de carboni durant els següents cent anys. El metà té un gran efecte per un breu període (aproximadament deu anys), mentre que el diòxid de carboni té un petit efecte per un període perllongat (sobre els cent anys). Degut a aquesta diferència en l'efecte i el període, el potencial d'escalfament global del metà en un termini de 20 anys és de 63. La concentració de metà s'ha incrementat un 150% des de 1750 i és responsable del 20% del <a href="/wiki/For%C3%A7ant_radiatiu" title="Forçant radiatiu">forçant radiatiu</a> total de tots els gasos hivernacles de llarga vida i distribució global.<sup id="cite_ref-Technical_summary_8-0" class="reference"><a href="#cite_note-Technical_summary-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> La concentració mitjana de metà en la superfície de la terra l'any 1998 era de 1.745 <a href="/w/index.php?title=Ppmm&action=edit&redlink=1" class="new" title="Ppmm (encara no existeix)">ppmm</a>.<sup id="cite_ref-Trace_Gases_9-0" class="reference"><a href="#cite_note-Trace_Gases-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> La seva concentració és més alta a l'hemisferi nord perquè la majoria de les fonts (naturals i antropogèniques) són més grans en aquell hemisferi. Les concentracions varien estacionalment amb un mínim a la fi de l'estiu. </p><p>El metà es forma prop de la superfície, i és transportat a l'<a href="/wiki/Estratosfera" title="Estratosfera">estratosfera</a> per l'aire ascendent dels <a href="/wiki/Tr%C3%B2pics" class="mw-redirect" title="Tròpics">tròpics</a>. L'augment incontrolat de metà a l'atmosfera de la Terra és controlat naturalment —encara que la influència humana pot interferir en aquesta regulació— per la reacció del metà amb el <a href="/wiki/Radical_hidroxil" title="Radical hidroxil">radical hidroxil</a>, una molècula formada per la reacció de l'oxigen atòmic amb l'aigua. </p><p>Al principi de la història de la Terra —aproximadament fa 3.500 milions d'anys— hi havia 1.000 vegades més metà a l'atmosfera que en l'actualitat. El metà primordial va ésser alliberat per l'activitat volcànica. Va ser durant aquesta època quan va aparèixer la vida a la Terra. Entre les primeres formes de vida es trobaven bacteris <a href="/w/index.php?title=Metan%C3%B2genes&action=edit&redlink=1" class="new" title="Metanògenes (encara no existeix)">metanògenes</a> que mitjançant l'hidrogen i el diòxid de carboni generaven metà i aigua. </p><p>L'oxigen no va ser un component majoritari de l'atmosfera fins que els organismes fotosintètics aparegueren més tard en la història de la Terra. Sense oxigen el meta podia romandre a l'atmosfera més temps i a més altres concentracions que en les actuals condicions. </p> <div class="mw-heading mw-heading3"><h3 id="Emissions_de_metà"><span id="Emissions_de_met.C3.A0"></span>Emissions de metà</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=12" title="Modifica la secció: Emissions de metà"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Houweling i cols. (1999) donen els següents valors per a les emissions de metà (Tg/a: teragrams per any):<sup id="cite_ref-Trace_Gases_9-1" class="reference"><a href="#cite_note-Trace_Gases-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:Meta-mitjana-global-2006catala.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Meta-mitjana-global-2006catala.png/220px-Meta-mitjana-global-2006catala.png" decoding="async" width="220" height="269" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Meta-mitjana-global-2006catala.png/330px-Meta-mitjana-global-2006catala.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/80/Meta-mitjana-global-2006catala.png/440px-Meta-mitjana-global-2006catala.png 2x" data-file-width="700" data-file-height="855" /></a><figcaption>Concentracions mitjanes de metà globals (NOAA)</figcaption></figure> <table style="text-align: right;" border="1" cellspacing="0" class="wikitable"> <tbody><tr> <th rowspan="2">Origen </th> <th colspan="3">Emissió <span class="chemf" style="white-space:nowrap;">CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span></span> </th></tr> <tr> <th>Massa (Tg/<a href="/wiki/Any" title="Any">a</a>) </th> <th>Tipus (%/a) </th> <th>Total (%/a) </th></tr> <tr> <th colspan="4">Emissions naturals </th></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/Aiguamolls" class="mw-redirect" title="Aiguamolls">Aiguamolls</a> (incl. arrossars) </td> <td>225 </td> <td>83 </td> <td>37 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/T%C3%A8rmit" class="mw-redirect" title="Tèrmit">Tèrmits</a> </td> <td>20 </td> <td>7 </td> <td>3 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/Oce%C3%A0" title="Oceà">Oceà</a> </td> <td>15 </td> <td>6 </td> <td>3 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/w/index.php?title=Hidrats&action=edit&redlink=1" class="new" title="Hidrats (encara no existeix)">Hidrats</a> </td> <td>10 </td> <td>4 </td> <td>2 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Total Natural </td> <td>270 </td> <td>100 </td> <td>45 </td></tr> <tr> <th colspan="4"><a href="/wiki/Antropog%C3%A8nic" class="mw-redirect" title="Antropogènic">Emissions antropogèniques</a> </th></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Energia </td> <td>110 </td> <td>33 </td> <td>18 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/Abocador" title="Abocador">Abocadors</a> </td> <td>40 </td> <td>12 </td> <td>7 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/Ruminant" class="mw-redirect" title="Ruminant">Ruminants</a> (boví) </td> <td>115 </td> <td>35 </td> <td>19 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Tractament de deixalles </td> <td>25 </td> <td>8 </td> <td>4 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Crema de Biomassa </td> <td>40 </td> <td>12 </td> <td>7 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Total Antropogènic </td> <td>330 </td> <td>100 </td> <td>55 </td></tr> <tr> <th colspan="4">Embornals </th></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/S%C3%B2l" title="Sòl">Sòls</a> </td> <td>-30 </td> <td>-5 </td> <td>-5 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh"><a href="/wiki/Hidroxil" class="mw-redirect" title="Hidroxil">OH</a> <a href="/wiki/Troposfera" title="Troposfera">Troposfèric</a> </td> <td>-510 </td> <td>-88 </td> <td>-85 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Pèrdua <a href="/wiki/Estratosfera" title="Estratosfera">estratosfèrica</a> </td> <td>-40 </td> <td>-7 </td> <td>-7 </td></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Embornal Total </td> <td>-580 </td> <td>-100 </td> <td>-97 </td></tr> <tr> <th colspan="4">Emissions + Embornals </th></tr> <tr> <td style="background: #ececec; text-align: left; padding-left: 0.5em; font-weight: bold;" class="table-rh">Desequilibri (tendència) </td> <td>+20 </td> <td>~2.78 Tg/ppmm </td> <td>+7.19 ppmm/a </td></tr></tbody></table> <p>Gairebé la meitat de l'emissió total és deguda a l'activitat humana.<sup id="cite_ref-Technical_summary_8-1" class="reference"><a href="#cite_note-Technical_summary-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Les plantes (p. ex. els boscs) han sigut recentment identificades com una important font de metà. Un article recent ha calculat unes emissions anuals de 62-236 milions de tones i que aquesta nova font pot tenir implicacions importants.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Tanmateix, els autors també senyalen que els seus descobriments són preliminars respecte a la importància exacta d'aquesta emissió de metà.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Alliberament_sobtat_dels_clatrats_de_metà"><span id="Alliberament_sobtat_dels_clatrats_de_met.C3.A0"></span>Alliberament sobtat dels clatrats de metà</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=13" title="Modifica la secció: Alliberament sobtat dels clatrats de metà"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A altes pressions com les que es troben al fons de l'oceà, el metà forma un <a href="/wiki/Clatrat" title="Clatrat">clatrat</a> sòlid amb l'aigua, conegut com a <a href="/wiki/Hidrat_de_met%C3%A0" title="Hidrat de metà">hidrat de metà</a>. La quantitat de metà que es troba atrapada amb aquesta forma en els sediments oceànics és desconeguda però possiblement és molt gran, de l'ordre del bilió de tones. La hipòtesi del "<a href="/wiki/Hip%C3%B2tesi_del_fusell_de_clatrats" title="Hipòtesi del fusell de clatrats">fusell de clatrats</a>" és una teoria que suggereix que si l'escalfament global produeix un augment de la temperatura suficient d'aquests dipòsits, tot aquest metà es podria alliberar sobtadament a l'atmosfera. Com que el metà és vint-i-tres vegades més potent (per al mateix pes, en un període de 100 anys) que el diòxid de carboni com a gas hivernacle, s'amplificaria de manera immensa l'efecte d'hivernacle, escalfant la Terra fins a nivells imprecedents. Aquesta teoria serviria també per explicar la causa d'esdeveniments de ràpid <a href="/wiki/Escalfament_global" title="Escalfament global">escalfament global</a> en el passat llunyà de la Terra, com el <a href="/wiki/M%C3%A0xim_t%C3%A8rmic_del_Paleoc%C3%A8-Eoc%C3%A8" title="Màxim tèrmic del Paleocè-Eocè">màxim tèrmic del Paleocè-Eocè</a> de fa 55 milions d'anys. </p> <div class="mw-heading mw-heading3"><h3 id="Emissió_de_metà_des_de_torberes_maltractades"><span id="Emissi.C3.B3_de_met.C3.A0_des_de_torberes_maltractades"></span>Emissió de metà des de torberes maltractades</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=14" title="Modifica la secció: Emissió de metà des de torberes maltractades"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Encara que siguin menys dramàtiques que les dels clatrats, les emissions de metà per part de les <a href="/wiki/Torbera" title="Torbera">torberes</a> mentre el <a href="/w/index.php?title=Pergelis%C3%B2l&action=edit&redlink=1" class="new" title="Pergelisòl (encara no existeix)">pergelisòl</a> es fon és un altre efecte que contribueix a l'augment del metà atmosfèric. Encara que els registres del pergelisòl són limitats, en anys recents (1999 i 2001) s'han batut els rècords de <a href="/wiki/Desgel" title="Desgel">desgel</a> al pergelisòl a <a href="/wiki/Alaska" title="Alaska">Alaska</a> i <a href="/wiki/Sib%C3%A8ria" title="Sibèria">Sibèria</a>. Les mesures recents a Sibèria també mostren que el metà alliberat és cinc vegades més gran que les estimacions prèvies.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> En temps normals, les torberes i les <a href="/wiki/Aiguamoll" title="Aiguamoll">aiguamolls</a> tenen un paper important en fixar grans quantitats metà i CO₂. La seva sobreexplotació —com a combustible o com terra en l'horticultura— així com el drenatge són una altra font d'emissions antropògens.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Mecanismes_d'eliminació"><span id="Mecanismes_d.27eliminaci.C3.B3"></span>Mecanismes d'eliminació</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=15" title="Modifica la secció: Mecanismes d'eliminació"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El principal mecanisme d'eliminació de metà de l'atmosfera és mitjançant la reacció amb el radical hidroxil, el qual es forma pel bombardeig dels <a href="/wiki/Raigs_c%C3%B2smics" title="Raigs còsmics">raigs còsmics</a> sobre les molècules de vapor d'aigua. </p> <dl><dd><span class="chemf" style="white-space:nowrap;">CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span> + <b>·</b>OH → <b>·</b>CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />3</span> + H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>O</span></dd></dl> <p>Aquesta reacció a la troposfera dona al metà una vida de 9,6 anys. Dos embornals més són el sòl (160 anys de vida) i la pèrdua estratosfèrica per la reacció amb les espècies químiques ·OH, Cl i O(¹D) a l'estratosfera (120 anys vida), donant lloc a una vida neta de 8,4 anys.<sup id="cite_ref-Trace_Gases_9-2" class="reference"><a href="#cite_note-Trace_Gases-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="El_metà_a_Mart"><span id="El_met.C3.A0_a_Mart"></span>El metà a Mart</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=16" title="Modifica la secció: El metà a Mart"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La presència demostrada de metà a <a href="/wiki/Mart_(planeta)" title="Mart (planeta)">Mart</a> constitueix encara un misteri i és un possible signe de vida a Mart. La variació estacional d'aquest gas en l'atmosfera marciana suggereix que hi ha una font activa d'origen geològic o biològic. </p><p><i>Syrtis Major</i> és una de les regions del planeta roig on s'origina el metà. El metà a Mart es va descobrir l'any 2003 i apareix en l'atmosfera marciana en una proporció de 10 parts per 1000 milions dins una atmosfera que en un 95% és de <a href="/wiki/Di%C3%B2xid_de_carboni" title="Diòxid de carboni">diòxid de carboni</a>. La sonda europea <a href="/wiki/Mars_Express" title="Mars Express">Mars Express</a> va confirmar la presència permanent de metà que donada la degradació fotoquímica que pateix només es pot explicar si hi ha una font renovable d'aquest gas.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p><p>L'origen del metà marcià pot ser geològic (volcànic, però tanmateix no hi ha evidències de volcans superficials) o biològic. En aquest segon cas haurien de ser microbis anaerobis que potser podrien viure sota la superfície en una possible aigua líquida.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p><p>Segons va publicar la revista <i><a href="/wiki/Science" title="Science">Science</a></i> el gener de 2009, s'han emprat detectors d'infrarojos des de telescopis terrestres i s'ha pogut observar l'evolució del metà al llarg de tres anys marcians (equivalents a 7 anys terrestres) i s'ha vist que el metà mostra variacions en el temps i acumulació en certes regions. Concretament s'ha vist que la font principal en contenia 19.000 tones amb una emissió per segon de 600 grams. La vida mitjana del metà a Mart és molt curta, de quatre anys terrestres, i potser el degraden oxidants presents en la pols flotant. </p><p>Una hipòtesi apunta a la presència de microbis sota el gel marcià, on la <a href="/wiki/Radiaci%C3%B3" title="Radiació">radiació</a> podria produir hidrogen a partir d'aigua líquida i el CO₂ proporcionar el carboni per a fer el metà. El proper rover marcià, <i><a href="/wiki/Mars_Science_Laboratory" title="Mars Science Laboratory">MSL</a></i>, estarà equipat amb sistemes per a mesurar metà i determinar quin isòtop de carboni conté. En cas de tractar-se de carboni-12, seria biològic. </p> <div class="mw-heading mw-heading2"><h2 id="Referències"><span id="Refer.C3.A8ncies"></span>Referències</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Met%C3%A0&action=edit&section=17" title="Modifica la secció: Referències"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist {{#if: | references-column-count references-column-count-{{{col}}}" style="list-style-type: decimal;"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://www.enciclopedia.cat/gran-enciclopedia-catalana/0123122.xml">Metà</a>». <i><a href="/wiki/Gran_Enciclop%C3%A8dia_Catalana" title="Gran Enciclopèdia Catalana">Gran Enciclopèdia Catalana</a></i>.  Barcelona:  <a href="/wiki/Grup_Enciclop%C3%A8dia_Catalana" class="mw-redirect" title="Grup Enciclopèdia Catalana">Grup Enciclopèdia Catalana</a>.</span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal" id="CITEREFRomán2014"><span style="font-variant: small-caps;">Román</span>, Rocío «<a rel="nofollow" class="external text" href="https://www.vilaweb.cat/noticia/4167645/20140117/gas-meta-risc-salut-humana-medi-ambient.html">El gas metà: risc per la salut humana i el medi ambient</a>». <i>VilaWeb</i>, 17-01-2014.</span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.grida.no/climate/ipcc_tar/wg1/248.htm">IPCC Third Assessment Report</a></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal" id="CITEREFefe2018"><span style="font-variant: small-caps;">efe</span> «<a rel="nofollow" class="external text" href="https://www.elpuntavui.cat/economia/article/18-economia/1405128-gas-natural-crea-una-planta-pilot-de-creacio-de-gas-renovable-a-sabadell.html">Gas Natural crea una planta pilot de creació de gas renovable a Sabadell - 04 juny 2018</a>». <i>El Punt Avui</i>, 04-06-2018, pàg. 26.</span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"><span class="citation book" style="font-style:normal"><span style="font-variant: small-caps;">Doreau</span>, M.; <span style="font-variant: small-caps;"><i>et alii</i></span>. <a rel="nofollow" class="external text" href="http://www.remugants.cat/2/upload/inra_2011_5.pdf"><i>Com reduir la producció de metà</i></a>.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Com+reduir+la+producci%C3%B3+de+met%C3%A0&rft.aulast=Doreau&rft.aufirst=M.&rft_id=http%3A%2F%2Fwww.remugants.cat%2F2%2Fupload%2Finra_2011_5.pdf"><span style="display: none;"> </span></span> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180916202017/http://www.remugants.cat/2/upload/inra_2011_5.pdf">Arxivat</a> 2018-09-16 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal" id="CITEREFFolch2008"><span style="font-variant: small-caps;">Folch</span>, Ramon «<a rel="nofollow" class="external text" href="https://web.archive.org/web/20180916202017/http://www.remugants.cat/2/upload/inra_2011_5.pdf">Metà ramader</a>». <i>el Periódico</i>, 13-07-2008. Arxivat de l'<a rel="nofollow" class="external text" href="http://www.remugants.cat/2/upload/inra_2011_5.pdf">original</a> el 2018-09-16 [Consulta: 16 setembre 2018].</span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><a href="#cite_ref-7">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://universitatsirecerca.gencat.cat/ca/detalls/noticia/Microorganismes-per-convertir-el-meta-directament-en-electricitat">Microorganismes per convertir el metà directament en electricitat</a>».  Generalitat de Catalunya, 28-02-2018. [Consulta: 16 setembre 2018].</span></span> </li> <li id="cite_note-Technical_summary-8"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Technical_summary_8-0">8,0</a></sup> <sup><a href="#cite_ref-Technical_summary_8-1">8,1</a></sup></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="https://web.archive.org/web/20110604120130/http://www.grida.no/climate/ipcc_tar/wg1/017.htm">Technical summary</a>». <i>Climate Change 2001</i>.  United Nations Environment Programme. Arxivat de l'<a rel="nofollow" class="external text" href="http://www.grida.no/climate/ipcc_tar/wg1/017.htm">original</a> el 2011-06-04. [Consulta: 18 abril 2007].</span></span> </li> <li id="cite_note-Trace_Gases-9"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Trace_Gases_9-0">9,0</a></sup> <sup><a href="#cite_ref-Trace_Gases_9-1">9,1</a></sup> <sup><a href="#cite_ref-Trace_Gases_9-2">9,2</a></sup></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="https://www.webcitation.org/69guEtsmG?url=http://www.grida.no/climate/ipcc_tar/wg1/134.htm#4211">Trace Gases: Current Observations, Trends, and Budgets</a>». <i>Climate Change 2001</i>.  United Nations Environment Programme. Arxivat de l'<a rel="nofollow" class="external text" href="http://www.grida.no/climate/ipcc_tar/wg1/134.htm#4211">original</a> el 2012-08-05. [Consulta: 18 abril 2007].</span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><a href="#cite_ref-10">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://www.nature.com/nature/journal/v439/n7073/abs/nature04420.html">Methane emissions from terrestrial plants under aerobic conditions</a>».  Nature, 12-01-2006. [Consulta: 7 setembre 2006].</span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><a href="#cite_ref-11">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://news.bbc.co.uk/2/hi/science/nature/4604332.stm">Plants revealed as methane source</a>».  BBC, 11-01-2006. [Consulta: 7 setembre 2006].</span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><a href="#cite_ref-12">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://www.eurekalert.org/pub_releases/2006-01/m-gw-011806.php">Global warming - the blame is not with the plants</a>».  eurekalert.org, 18-01-2006. [Consulta: 6 setembre 2006].</span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><a href="#cite_ref-13">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://news.bbc.co.uk/2/hi/science/nature/5321046.stm">Methane bubbles climate trouble</a>».  BBC, 07-09-2006. [Consulta: 7 setembre 2006].</span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><a href="#cite_ref-14">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal" id="CITEREFEngst2013"><span style="font-variant: small-caps;">Engst</span>, Thomas «<a rel="nofollow" class="external text" href="https://naturgebloggt.de/moore-viel-mehr-als-nur-schlamm/">Moore- viel mehr als nur Schlamm</a>» (en alemany). <i>Naturgebloggt</i>, 24-09-2013.</span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><a href="#cite_ref-15">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="https://www.bundesregierung.de/Content/DE/Artikel/2014/08/2014-08-14-sommer-moore.html">Moore mindern CO2</a>» (en alemany).  Bundesregierung, 14-08-2014. [Consulta: 16 setembre 2018].</span></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><a href="#cite_ref-16">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal" id="CITEREFA._M.2016"><span style="font-variant: small-caps;">A. M.</span> «<a rel="nofollow" class="external text" href="https://www.elperiodico.cat/ca/ciencia/20161015/tgo-nomad-busca-meta-mart-5520303">Metà, ¿indici de vida en Mart?</a>». <i>El Periodico</i>, 15-10-2016.</span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><a href="#cite_ref-17">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal"> «<a rel="nofollow" class="external text" href="http://www.ccma.cat/324/troben-mollecules-organiques-i-gas-meta-que-indicarien-possible-vida-a-mart/noticia/2860240/">Troben molècules orgàniques i gas metà, que indicarien possible vida a Mart</a>». <i>TV3 Notícies</i>, 08-06-2018.</span></span> </li> </ol></div></div> <div role="navigation" class="navbox" aria-labelledby="Alcans" style="padding:3px"><table class="nowraplinks collapsible collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div class="plainlinks hlist navbar mini"><ul><li class="nv-view"><span typeof="mw:File"><a href="/wiki/Plantilla:Alcans" title="Plantilla:Alcans"><img alt="Vegeu aquesta plantilla" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Commons-emblem-notice.svg/18px-Commons-emblem-notice.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Commons-emblem-notice.svg/27px-Commons-emblem-notice.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/28/Commons-emblem-notice.svg/36px-Commons-emblem-notice.svg.png 2x" data-file-width="48" data-file-height="48" /></a></span></li></ul></div><div id="Alcans" style="font-size:114%;margin:0 4em"><a href="/wiki/Alc%C3%A0" title="Alcà">Alcans</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0px"><div style="padding:0em 0.25em"><a class="mw-selflink selflink">Metà</a> (<span class="chemf" style="white-space:nowrap;">CH<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span></span>) - <a href="/wiki/Et%C3%A0" title="Età">Età</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />2</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />6</span></span>) - <a href="/wiki/Prop%C3%A0" title="Propà">Propà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />3</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />8</span></span>) - <a href="/wiki/But%C3%A0" title="Butà">Butà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />4</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />10</span></span>) - <a href="/wiki/Pent%C3%A0" title="Pentà">Pentà</a>(<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />5</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />12</span></span>) - <a href="/wiki/Hex%C3%A0" title="Hexà">Hexà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />6</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />14</span></span>) - <a href="/wiki/Hept%C3%A0" title="Heptà">Heptà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />7</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />16</span></span>) - <a href="/wiki/Oct%C3%A0" title="Octà">Octà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />8</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />18</span></span>) - <a href="/wiki/Non%C3%A0" title="Nonà">Nonà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />9</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />20</span></span>) - <a href="/wiki/Dec%C3%A0" title="Decà">Decà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />10</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />22</span></span>) - <a href="/wiki/Undec%C3%A0" title="Undecà">Undecà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />11</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />24</span></span>) - <a href="/wiki/Dodec%C3%A0" title="Dodecà">Dodecà</a> (<span class="chemf" style="white-space:nowrap;">C<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />12</span>H<span style="display:inline-block; margin-bottom:-0.3em; vertical-align:-0.4em; line-height:1.2em; font-size:70%; text-align:left;"><br />26</span></span>)</div></td></tr></tbody></table></div> <table cellpadding="2" cellspacing="0" align="right" style="margin:5px; padding: 5px; border:1px solid #aaaaaa; text-align:left;" class="infobox noprint plainlinks"> <tbody><tr> <td colspan="2" style="text-align:center; font-size:85%">En altres projectes de <a href="/wiki/Fundaci%C3%B3_Wikimedia" title="Fundació Wikimedia">Wikimedia</a>: </td></tr> <tr> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/Fitxer:Commons-logo.svg" class="mw-file-description" title="Commons"><img alt="Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/17px-Commons-logo.svg.png" decoding="async" width="17" height="23" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/26px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/34px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a><figcaption>Commons</figcaption></figure></td> <td><a href="https://commons.wikimedia.org/wiki/Category:Methane" class="extiw" title="commons:Category:Methane"><b>Commons</b></a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a 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class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Biblioth%C3%A8que_nationale_de_France" class="mw-redirect" title="Bibliothèque nationale de France">BNF</a> <span class="uid"> (<a rel="nofollow" class="external text" href="http://catalogue.bnf.fr/ark:/12148/cb11980022t">1</a>)</span></li> <li><a href="/wiki/Gemeinsame_Normdatei" title="Gemeinsame Normdatei">GND</a> <span class="uid"> (<a rel="nofollow" class="external text" href="http://d-nb.info/gnd/4169678-5">1</a>)</span></li> <li><a href="/wiki/LCCN" class="mw-redirect" title="LCCN">LCCN</a> <span class="uid"> (<a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/subjects/sh85084379">1</a>)</span></li> <li><a href="/wiki/National_Diet_Library" class="mw-redirect" title="National Diet Library">NDL</a> <span class="uid"> (<a rel="nofollow" class="external text" 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class="nowraplinks navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th id="Identificadors" scope="row" class="navbox-group" style="width:1%">Identificadors</th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"><a rel="nofollow" class="external text" href="https://chem.nlm.nih.gov/chemidplus/rn/74-82-8">CAS</a><span style="font-weight:bold;"> ·</span>  <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P231" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/sites/entrez?cmd=search&db=pccompound&term=VNWKTOKETHGBQD-UHFFFAOYSA-N">InChIKey</a><span style="font-weight:bold;"> ·</span>  <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P235" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, 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/></a></span></span>RTECS: PA1490000<span style="font-weight:bold;"> ·</span>  <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P657" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span><a rel="nofollow" class="external text" href="https://echa.europa.eu/substance-information/-/substanceinfo/200-812-7">AEPQ</a><span style="font-weight:bold;"> ·</span>  <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P232" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span><a rel="nofollow" class="external text" href="https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:16183">ChEBI</a><span style="font-weight:bold;"> ·</span>  <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P683" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span>ONU: 1971<span style="font-weight:bold;"> ·</span>  <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q37129?uselang=ca#P695" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" 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