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page-Celeritat rootpage-Celeritat 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=Celeritat" 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=Celeritat" 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=Celeritat" 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=Celeritat" 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-Concepte" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Concepte"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Concepte</span> </div> </a> <ul id="toc-Concepte-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Unitats" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Unitats"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Unitats</span> </div> </a> <ul id="toc-Unitats-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Exemples" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exemples"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Exemples</span> </div> </a> <ul id="toc-Exemples-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">4</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliografia" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bibliografia"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Bibliografia</span> </div> </a> <ul id="toc-Bibliografia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Enllaços_externs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Enllaços_externs"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Enllaços externs</span> </div> </a> <ul id="toc-Enllaços_externs-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">Celeritat</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 84 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-84" 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">84 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/Spoed" title="Spoed - afrikaans" lang="af" hreflang="af" data-title="Spoed" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%8C%A5%E1%8B%B5%E1%8D%88%E1%89%B5" title="ጥድፈት - amhàric" lang="am" hreflang="am" data-title="ጥድፈት" data-language-autonym="አማርኛ" data-language-local-name="amhàric" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%B1%D8%B9%D8%A9" title="سرعة - àrab" lang="ar" hreflang="ar" data-title="سرعة" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D8%B2%D8%B1%D8%A8%D8%A9" title="زربة - Moroccan Arabic" lang="ary" hreflang="ary" data-title="زربة" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%A6%E0%A7%8D%E0%A7%B0%E0%A7%81%E0%A6%A4%E0%A6%BF" title="দ্ৰুতি - assamès" lang="as" hreflang="as" data-title="দ্ৰুতি" data-language-autonym="অসমীয়া" data-language-local-name="assamès" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Rapidez" title="Rapidez - asturià" lang="ast" hreflang="ast" data-title="Rapidez" 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/S%C3%BCr%C9%99t" title="Sürət - azerbaidjanès" lang="az" hreflang="az" data-title="Sürət" 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/%DB%8C%D8%A6%DB%8C%DB%8C%D9%86%D9%84%DB%8C%DA%A9" title="یئیینلیک - South Azerbaijani" lang="azb" hreflang="azb" data-title="یئیینلیک" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-bat-smg mw-list-item"><a href="https://bat-smg.wikipedia.org/wiki/Veikis" title="Veikis - Samogitian" lang="sgs" hreflang="sgs" data-title="Veikis" data-language-autonym="Žemaitėška" data-language-local-name="Samogitian" class="interlanguage-link-target"><span>Žemaitėška</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Rikas" title="Rikas - Central Bikol" lang="bcl" hreflang="bcl" data-title="Rikas" 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-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%A6%E0%A7%8D%E0%A6%B0%E0%A7%81%E0%A6%A4%E0%A6%BF" title="দ্রুতি - bengalí" lang="bn" hreflang="bn" data-title="দ্রুতি" 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/Tizh" title="Tizh - bretó" lang="br" hreflang="br" data-title="Tizh" data-language-autonym="Brezhoneg" data-language-local-name="bretó" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/S%C3%B3k-l%C5%ADk" title="Sók-lŭk - Mindong" lang="cdo" hreflang="cdo" data-title="Sók-lŭk" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%AE%DB%8E%D8%B1%D8%A7%DB%8C%DB%8C" title="خێرایی - kurd central" lang="ckb" hreflang="ckb" data-title="خێرایی" data-language-autonym="کوردی" data-language-local-name="kurd central" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Buanedd" title="Buanedd - gal·lès" lang="cy" hreflang="cy" data-title="Buanedd" 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/Fart" title="Fart - danès" lang="da" hreflang="da" data-title="Fart" data-language-autonym="Dansk" data-language-local-name="danès" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Speed" title="Speed - anglès" lang="en" hreflang="en" data-title="Speed" 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/Rapido" title="Rapido - esperanto" lang="eo" hreflang="eo" data-title="Rapido" 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/Celeridad" title="Celeridad - espanyol" lang="es" hreflang="es" data-title="Celeridad" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu badge-Q70893996 mw-list-item" title=""><a href="https://eu.wikipedia.org/wiki/Abiadura-modulu" title="Abiadura-modulu - basc" lang="eu" hreflang="eu" data-title="Abiadura-modulu" 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/%D8%B3%D8%B1%D8%B9%D8%AA" title="سرعت - persa" lang="fa" hreflang="fa" data-title="سرعت" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fiu-vro mw-list-item"><a href="https://fiu-vro.wikipedia.org/wiki/Kib%C3%B5hus" title="Kibõhus - Võro" lang="vro" hreflang="vro" data-title="Kibõhus" data-language-autonym="Võro" data-language-local-name="Võro" class="interlanguage-link-target"><span>Võro</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Totolo" title="Totolo - fijià" lang="fj" hreflang="fj" data-title="Totolo" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="fijià" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Vitesse" title="Vitesse - francès" lang="fr" hreflang="fr" data-title="Vitesse" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Luas_(fisic)" title="Luas (fisic) - irlandès" lang="ga" hreflang="ga" data-title="Luas (fisic)" 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/Celeridade" title="Celeridade - gallec" lang="gl" hreflang="gl" data-title="Celeridade" data-language-autonym="Galego" data-language-local-name="gallec" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gv mw-list-item"><a href="https://gv.wikipedia.org/wiki/Bieauid" title="Bieauid - manx" lang="gv" hreflang="gv" data-title="Bieauid" data-language-autonym="Gaelg" data-language-local-name="manx" class="interlanguage-link-target"><span>Gaelg</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%9A%E0%A4%BE%E0%A4%B2" title="चाल - hindi" lang="hi" hreflang="hi" data-title="चाल" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Speed" title="Speed - crioll d’Haití" lang="ht" hreflang="ht" data-title="Speed" data-language-autonym="Kreyòl ayisyen" data-language-local-name="crioll d’Haití" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Rapiditate" title="Rapiditate - interlingua" lang="ia" hreflang="ia" data-title="Rapiditate" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Kelajuan" title="Kelajuan - indonesi" lang="id" hreflang="id" data-title="Kelajuan" 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/Rapideso" title="Rapideso - ido" lang="io" hreflang="io" data-title="Rapideso" 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/Fer%C3%B0" title="Ferð - islandès" lang="is" hreflang="is" data-title="Ferð" data-language-autonym="Íslenska" data-language-local-name="islandès" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%80%9F%E3%81%95" title="速さ - japonès" lang="ja" hreflang="ja" data-title="速さ" 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-kaa mw-list-item"><a href="https://kaa.wikipedia.org/wiki/Tezlik" title="Tezlik - karakalpak" lang="kaa" hreflang="kaa" data-title="Tezlik" data-language-autonym="Qaraqalpaqsha" data-language-local-name="karakalpak" class="interlanguage-link-target"><span>Qaraqalpaqsha</span></a></li><li class="interlanguage-link interwiki-kbp mw-list-item"><a href="https://kbp.wikipedia.org/wiki/%C3%91%C9%A9%C9%A3y%CA%8B%CA%8B_taa_se%C9%A3a" title="Ñɩɣyʋʋ taa seɣa - Kabiye" lang="kbp" hreflang="kbp" data-title="Ñɩɣyʋʋ taa seɣa" data-language-autonym="Kabɩyɛ" data-language-local-name="Kabiye" class="interlanguage-link-target"><span>Kabɩyɛ</span></a></li><li class="interlanguage-link interwiki-kcg mw-list-item"><a href="https://kcg.wikipedia.org/wiki/Cung" title="Cung - tyap" lang="kcg" hreflang="kcg" data-title="Cung" data-language-autonym="Tyap" data-language-local-name="tyap" class="interlanguage-link-target"><span>Tyap</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9E%D1%80%D1%82%D0%B0%D1%88%D0%B0_%D0%B6%D1%8B%D0%BB%D0%B4%D0%B0%D0%BC%D0%B4%D1%8B%D2%9B" title="Орташа жылдамдық - kazakh" lang="kk" hreflang="kk" data-title="Орташа жылдамдық" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%86%8D%EB%A0%A5" title="속력 - coreà" lang="ko" hreflang="ko" data-title="속력" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-kw mw-list-item"><a href="https://kw.wikipedia.org/wiki/Tooth" title="Tooth - còrnic" lang="kw" hreflang="kw" data-title="Tooth" data-language-autonym="Kernowek" data-language-local-name="còrnic" class="interlanguage-link-target"><span>Kernowek</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Celeritas" title="Celeritas - llatí" lang="la" hreflang="la" data-title="Celeritas" data-language-autonym="Latina" data-language-local-name="llatí" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Rapidia" title="Rapidia - Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Rapidia" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Greitis" title="Greitis - lituà" lang="lt" hreflang="lt" data-title="Greitis" 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/Kust%C4%ABbas_%C4%81trums" title="Kustības ātrums - letó" lang="lv" hreflang="lv" data-title="Kustības ātrums" data-language-autonym="Latviešu" data-language-local-name="letó" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B5%E0%B5%87%E0%B4%97%E0%B4%82" title="വേഗം - malaiàlam" lang="ml" hreflang="ml" data-title="വേഗം" 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%A5%D1%83%D1%80%D0%B4%D0%BD%D1%8B_%D1%85%D1%8D%D0%BC%D0%B6%D1%8D%D1%8D" title="Хурдны хэмжээ - mongol" lang="mn" hreflang="mn" data-title="Хурдны хэмжээ" 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%9A%E0%A4%BE%E0%A4%B2_(%E0%A4%AD%E0%A5%8C%E0%A4%A4%E0%A4%BF%E0%A4%95%E0%A5%80)" title="चाल (भौतिकी) - marathi" lang="mr" hreflang="mr" data-title="चाल (भौतिकी)" 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/Kelajuan" title="Kelajuan - malai" lang="ms" hreflang="ms" data-title="Kelajuan" 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%A1%E1%80%99%E1%80%BC%E1%80%94%E1%80%BA%E1%80%94%E1%80%BE%E1%80%AF%E1%80%94%E1%80%BA%E1%80%B8" title="အမြန်နှုန်း - birmà" lang="my" hreflang="my" data-title="အမြန်နှုန်း" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="birmà" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%B5%E0%A5%87%E0%A4%97" title="वेग - nepalès" lang="ne" hreflang="ne" data-title="वेग" data-language-autonym="नेपाली" data-language-local-name="nepalès" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-new mw-list-item"><a href="https://new.wikipedia.org/wiki/%E0%A4%97%E0%A4%A4%E0%A4%BF" title="गति - newari" lang="new" hreflang="new" data-title="गति" data-language-autonym="नेपाल भाषा" data-language-local-name="newari" class="interlanguage-link-target"><span>नेपाल भाषा</span></a></li><li class="interlanguage-link interwiki-nl badge-Q70894304 mw-list-item" title=""><a href="https://nl.wikipedia.org/wiki/Grootte_van_de_snelheid" title="Grootte van de snelheid - neerlandès" lang="nl" hreflang="nl" data-title="Grootte van de snelheid" 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/Fart" title="Fart - noruec nynorsk" lang="nn" hreflang="nn" data-title="Fart" 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/Fart" title="Fart - noruec bokmål" lang="nb" hreflang="nb" data-title="Fart" 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-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Saffisa" title="Saffisa - oromo" lang="om" hreflang="om" data-title="Saffisa" 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%97%E0%A8%A4%E0%A9%80" title="ਗਤੀ - panjabi" lang="pa" hreflang="pa" data-title="ਗਤੀ" 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/Szybko%C5%9B%C4%87" title="Szybkość - polonès" lang="pl" hreflang="pl" data-title="Szybkość" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Rapidez" title="Rapidez - portuguès" lang="pt" hreflang="pt" data-title="Rapidez" 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/Vitez%C4%83_liniar%C4%83" title="Viteză liniară - romanès" lang="ro" hreflang="ro" data-title="Viteză liniară" data-language-autonym="Română" data-language-local-name="romanès" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-sc mw-list-item"><a href="https://sc.wikipedia.org/wiki/Lestresa" title="Lestresa - sard" lang="sc" hreflang="sc" data-title="Lestresa" data-language-autonym="Sardu" data-language-local-name="sard" class="interlanguage-link-target"><span>Sardu</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Vilucitati" title="Vilucitati - sicilià" lang="scn" hreflang="scn" data-title="Vilucitati" data-language-autonym="Sicilianu" data-language-local-name="sicilià" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%B1%D9%81%D8%AA%D8%A7%D8%B1" title="رفتار - sindi" lang="sd" hreflang="sd" data-title="رفتار" data-language-autonym="سنڌي" data-language-local-name="sindi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B7%80%E0%B7%9A%E0%B6%9C%E0%B6%BA" title="වේගය - singalès" lang="si" hreflang="si" data-title="වේගය" data-language-autonym="සිංහල" data-language-local-name="singalès" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Speed" title="Speed - Simple English" lang="en-simple" hreflang="en-simple" data-title="Speed" 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-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Spidhi" title="Spidhi - shona" lang="sn" hreflang="sn" data-title="Spidhi" data-language-autonym="ChiShona" data-language-local-name="shona" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Xawaare" title="Xawaare - somali" lang="so" hreflang="so" data-title="Xawaare" data-language-autonym="Soomaaliga" data-language-local-name="somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Shpejt%C3%ABsia" title="Shpejtësia - albanès" lang="sq" hreflang="sq" data-title="Shpejtësia" data-language-autonym="Shqip" data-language-local-name="albanès" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr badge-Q70893996 mw-list-item" title=""><a href="https://sr.wikipedia.org/wiki/Magnituda_brzine_kretanja" title="Magnituda brzine kretanja - serbi" lang="sr" hreflang="sr" data-title="Magnituda brzine kretanja" 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-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Laju" title="Laju - sondanès" lang="su" hreflang="su" data-title="Laju" data-language-autonym="Sunda" data-language-local-name="sondanès" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Fart" title="Fart - suec" lang="sv" hreflang="sv" data-title="Fart" 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/Kasi" title="Kasi - suahili" lang="sw" hreflang="sw" data-title="Kasi" data-language-autonym="Kiswahili" data-language-local-name="suahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B5%E0%AF%87%E0%AE%95%E0%AE%AE%E0%AF%8D" title="வேகம் - tàmil" lang="ta" hreflang="ta" data-title="வேகம்" data-language-autonym="தமிழ்" data-language-local-name="tàmil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B1%E0%B8%95%E0%B8%A3%E0%B8%B2%E0%B9%80%E0%B8%A3%E0%B9%87%E0%B8%A7" title="อัตราเร็ว - tai" lang="th" hreflang="th" data-title="อัตราเร็ว" 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/Bilis" title="Bilis - tagal" lang="tl" hreflang="tl" data-title="Bilis" 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/S%C3%BCrat" title="Sürat - turc" lang="tr" hreflang="tr" data-title="Sürat" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B5%D1%80%D0%B5%D0%B4%D0%BD%D1%8F_%D1%81%D0%BA%D0%B0%D0%BB%D1%8F%D1%80%D0%BD%D0%B0_%D1%88%D0%B2%D0%B8%D0%B4%D0%BA%D1%96%D1%81%D1%82%D1%8C" title="Середня скалярна швидкість - ucraïnès" lang="uk" hreflang="uk" data-title="Середня скалярна швидкість" 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/%D8%B1%D9%81%D8%AA%D8%A7%D8%B1" title="رفتار - urdú" lang="ur" hreflang="ur" data-title="رفتار" data-language-autonym="اردو" data-language-local-name="urdú" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/T%E1%BB%91c_%C4%91%E1%BB%99" title="Tốc độ - vietnamita" lang="vi" hreflang="vi" data-title="Tốc độ" 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/Kalaksi" title="Kalaksi - waray" lang="war" hreflang="war" data-title="Kalaksi" 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/%E9%80%9F%E7%8E%87" title="速率 - xinès wu" lang="wuu" hreflang="wuu" data-title="速率" 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-xh mw-list-item"><a href="https://xh.wikipedia.org/wiki/Isantya" title="Isantya - xosa" lang="xh" hreflang="xh" data-title="Isantya" data-language-autonym="IsiXhosa" data-language-local-name="xosa" class="interlanguage-link-target"><span>IsiXhosa</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E9%80%9F%E7%8E%87" title="速率 - xinès" lang="zh" hreflang="zh" data-title="速率" 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-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Sok-le%CC%8Dk" title="Sok-le̍k - xinès min del sud" lang="nan" hreflang="nan" data-title="Sok-le̍k" 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/%E9%80%9F%E7%8E%87" title="速率 - cantonès" lang="yue" hreflang="yue" data-title="速率" 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/Q3711325#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 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href="/wiki/Especial:Seguiment/Celeritat" 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=Celeritat&oldid=32259553" 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=Celeritat&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=Celeritat&id=32259553&wpFormIdentifier=titleform" title="Informació sobre com citar aquesta pàgina"><span>Citau aquest article</span></a></li><li id="t-urlshortener" 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href="/w/index.php?title=Celeritat&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:Speed" 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/Q3711325" 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 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src="//upload.wikimedia.org/wikipedia/commons/thumb/9/97/Noun_project_1842.svg/25px-Noun_project_1842.svg.png" decoding="async" width="25" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/97/Noun_project_1842.svg/38px-Noun_project_1842.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/97/Noun_project_1842.svg/50px-Noun_project_1842.svg.png 2x" data-file-width="100" data-file-height="100" /></a></span></span>Celeritat</caption><tbody><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><span typeof="mw:File"><a href="/wiki/Fitxer:Mersan.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/44/Mersan.JPG/300px-Mersan.JPG" decoding="async" width="300" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/44/Mersan.JPG/450px-Mersan.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/44/Mersan.JPG/600px-Mersan.JPG 2x" data-file-width="3072" data-file-height="2304" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee">Símbol</th><td class="infobox-data"><i>v</i></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee">Unitats</th><td class="infobox-data"><a href="/wiki/Metre" title="Metre">m</a> / <a href="/wiki/Segon" title="Segon">s</a></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee">Fórmula</th><td class="infobox-data"><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle v=s/t}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>v</mi> <mo>=</mo> <mi>s</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>t</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle v=s/t}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c9873e85bb5ee76530f1468777977ec27bcdc670" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:7.319ex; height:2.843ex;" alt="{\displaystyle v=s/t}"></span> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q3711325?uselang=ca#P2534" 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> <table class="vertical-navbox nowraplinks" style="float:right;clear:right;width:22.0em;margin:0 0 1.0em 1.0em;color:#202122;background-color:#f8f9fa;border:1px solid #a2a9b1;padding:0.2em;border-spacing:0.4em 0;text-align:center;line-height:1.4em;font-size:88%;width:220px"><tbody><tr><th style="padding:0.2em 0.4em 0.2em;font-size:145%;line-height:1.2em"><a href="/wiki/Mec%C3%A0nica_cl%C3%A0ssica" title="Mecànica clàssica">Mecànica clàssica</a></th></tr><tr><td style="padding:0 0.1em 0.4em"> <a href="/w/index.php?title=Hist%C3%B2ria_de_la_mec%C3%A0nica_cl%C3%A0ssica&action=edit&redlink=1" class="new" title="Història de la mecànica clàssica (encara no existeix)">Història</a><br /><a href="/wiki/Cronologia_de_la_mec%C3%A0nica_cl%C3%A0ssica" title="Cronologia de la mecànica clàssica">Cronologia</a></td> </tr><tr><td style="padding:0 0.1em 0.4em"> <div class="NavFrame collapsed" style="border:none;padding:0"><div class="NavHead" style="font-size:105%;text-align:left">Branques</div><div class="NavContent" style="font-size:105%;padding:0.2em 0 0.4em;text-align:center"><a href="/wiki/Est%C3%A0tica" title="Estàtica">Estàtica</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Din%C3%A0mica" title="Dinàmica">Dinàmica</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Cinem%C3%A0tica" title="Cinemàtica">Cinemàtica</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Mec%C3%A0nica_aplicada" title="Mecànica aplicada">Mecànica aplicada</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Mec%C3%A0nica_celeste" title="Mecànica celeste">Mecànica celeste</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Mec%C3%A0nica_dels_medis_continus" title="Mecànica dels medis continus">Mecànica dels medis continus</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Mec%C3%A0nica_estad%C3%ADstica" title="Mecànica estadística">Mecànica estadística</a></div></div></td> </tr><tr><td style="padding:0 0.1em 0.4em"> <div class="NavFrame collapsed" style="border:none;padding:0"><div class="NavHead" style="font-size:105%;text-align:left">Formulacions</div><div class="NavContent" style="font-size:105%;padding:0.2em 0 0.4em;text-align:center"><div style="text-align:left;"> <ul><li><a href="/wiki/Lleis_de_Newton" title="Lleis de Newton">Mecànica newtoniana</a></li> <li><a href="/wiki/Mec%C3%A0nica_anal%C3%ADtica" title="Mecànica analítica">Mecànica analítica</a>: <ul><li><a href="/wiki/Formulaci%C3%B3_lagrangiana" title="Formulació lagrangiana">Mecànica lagrangiana</a></li> <li><a href="/wiki/Formulaci%C3%B3_hamiltoniana" title="Formulació hamiltoniana">Mecànica hamiltoniana</a></li></ul></li></ul></div></div></div></td> </tr><tr><td style="padding:0 0.1em 0.4em"> <div class="NavFrame" style="border:none;padding:0"><div class="NavHead" style="font-size:105%;text-align:left">Conceptes fonamentals</div><div class="NavContent" style="font-size:105%;padding:0.2em 0 0.4em;text-align:center"><a href="/wiki/Espai" title="Espai">Espai</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Temps" title="Temps">Temps</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Velocitat" title="Velocitat">Velocitat</a><span style="font-weight:bold;"> ·</span> <a class="mw-selflink selflink">Celeritat</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Massa" title="Massa">Massa</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Acceleraci%C3%B3" title="Acceleració">Acceleració</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Gravetat" title="Gravetat">Gravetat</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/For%C3%A7a" title="Força">Força</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Impuls_(f%C3%ADsica)" title="Impuls (física)">Impuls</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Parell_de_forces" title="Parell de forces">Parell</a> / <a href="/wiki/Moment" title="Moment">Moment</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Quantitat_de_moviment" title="Quantitat de moviment">Quantitat de moviment</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moment_angular" title="Moment angular">Moment angular</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/In%C3%A8rcia" title="Inèrcia">Inèrcia</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moment_d%27in%C3%A8rcia" title="Moment d'inèrcia">Moment d'inèrcia</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Sistema_de_refer%C3%A8ncia" title="Sistema de referència">Sistema de referència</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Energia" title="Energia">Energia</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Energia_cin%C3%A8tica" title="Energia cinètica">Energia cinètica</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Energia_potencial" title="Energia potencial">Energia potencial</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Treball_mec%C3%A0nic" class="mw-redirect" title="Treball mecànic">Treball mecànic</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Treball_virtual" title="Treball virtual">Treball virtual</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Principi_de_d%27Alembert" title="Principi de d'Alembert">Principi de d'Alembert</a></div></div></td> </tr><tr><td style="padding:0 0.1em 0.4em"> <div class="NavFrame collapsed" style="border:none;padding:0"><div class="NavHead" style="font-size:105%;text-align:left">Temes principals</div><div class="NavContent" style="font-size:105%;padding:0.2em 0 0.4em;text-align:center"><a href="/wiki/S%C3%B2lid_r%C3%ADgid" title="Sòlid rígid">Sòlid rígid</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Din%C3%A0mica_del_s%C3%B2lid_r%C3%ADgid" title="Dinàmica del sòlid rígid">Dinàmica del sòlid rígid</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Equacions_d%27Euler" class="mw-redirect" title="Equacions d'Euler">Equacions d'Euler</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moviment_(f%C3%ADsica)" class="mw-redirect" title="Moviment (física)">Moviment</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Lleis_de_Newton" title="Lleis de Newton">Lleis de Newton</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Llei_de_la_gravitaci%C3%B3_universal" title="Llei de la gravitació universal">Llei de la gravitació universal</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Equacions_del_moviment" class="mw-redirect" title="Equacions del moviment">Equacions del moviment</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Sistema_de_refer%C3%A8ncia_inercial" title="Sistema de referència inercial">Sistema de referència inercial</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Sistema_de_refer%C3%A8ncia_no_inercial" title="Sistema de referència no inercial">Sistema de referència no inercial</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Sistema_de_refer%C3%A8ncia_amb_rotaci%C3%B3" class="mw-redirect" title="Sistema de referència amb rotació">Sistema de referència amb rotació</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/For%C3%A7a_fict%C3%ADcia" class="mw-redirect" title="Força fictícia">Força fictícia</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moviment_rectilini" title="Moviment rectilini">Moviment rectilini</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Despla%C3%A7ament_(cinem%C3%A0tica)" title="Desplaçament (cinemàtica)">Desplaçament</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Velocitat_relativa" title="Velocitat relativa">Velocitat relativa</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Fricci%C3%B3" title="Fricció">Fricció</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moviment_harm%C3%B2nic_simple" title="Moviment harmònic simple">Moviment harmònic simple</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Oscil%C2%B7lador_harm%C3%B2nic" title="Oscil·lador harmònic">Oscil·lador harmònic</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Vibraci%C3%B3" title="Vibració">Vibració</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Esmorte%C3%AFment" title="Esmorteïment">Esmorteïment</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moviment_de_rotaci%C3%B3" class="mw-redirect" title="Moviment de rotació">Moviment de rotació</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Moviment_circular" title="Moviment circular">Moviment circular</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/For%C3%A7a_centr%C3%ADpeta" title="Força centrípeta">Força centrípeta</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/For%C3%A7a_centr%C3%ADfuga" title="Força centrífuga">Força centrífuga</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Efecte_de_Coriolis" title="Efecte de Coriolis">Efecte de Coriolis</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/P%C3%A8ndol_(matem%C3%A0tiques)" title="Pèndol (matemàtiques)">Pèndol</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Acceleraci%C3%B3_angular" title="Acceleració angular">Acceleració angular</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Velocitat_angular" title="Velocitat angular">Velocitat angular</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Freq%C3%BC%C3%A8ncia_angular" class="mw-redirect" title="Freqüència angular">Freqüència angular</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Despla%C3%A7ament_angular" title="Desplaçament angular">Desplaçament angular</a></div></div></td> </tr><tr><td style="padding:0 0.1em 0.4em"> <div class="NavFrame collapsed" style="border:none;padding:0"><div class="NavHead" style="font-size:105%;text-align:left">Científics</div><div class="NavContent" style="font-size:105%;padding:0.2em 0 0.4em;text-align:center"><a href="/wiki/Galileo_Galilei" title="Galileo Galilei">Galileo Galilei</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Isaac_Newton" title="Isaac Newton">Isaac Newton</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Jeremiah_Horrocks" title="Jeremiah Horrocks">Jeremiah Horrocks</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Leonhard_Euler" title="Leonhard Euler">Leonhard Euler</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Jean_le_Rond_d%27Alembert" title="Jean le Rond d'Alembert">Jean le Rond d'Alembert</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Alexis_Clairaut" class="mw-redirect" title="Alexis Clairaut">Alexis Clairaut</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Joseph_Louis_Lagrange" title="Joseph Louis Lagrange">Joseph Louis Lagrange</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Pierre-Simon_Laplace" title="Pierre-Simon Laplace">Pierre-Simon Laplace</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/William_Rowan_Hamilton" title="William Rowan Hamilton">William Rowan Hamilton</a><span style="font-weight:bold;"> ·</span> <a href="/wiki/Sim%C3%A9on-Denis_Poisson" class="mw-redirect" title="Siméon-Denis Poisson">Siméon-Denis Poisson</a></div></div></td> </tr><tr><td style="text-align:right;font-size:115%;padding-top: 0.6em;"><div class="plainlinks hlist navbar mini"><ul><li class="nv-view"><span typeof="mw:File"><a href="/wiki/Plantilla:Mec%C3%A0nica_cl%C3%A0ssica" title="Plantilla:Mecànica clàssica"><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></td></tr></tbody></table> <p>En <a href="/wiki/F%C3%ADsica" title="Física">física</a>, la <b>celeritat</b>, <b>rapidesa</b> o <b>ràpida</b><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> és un valor <a href="/wiki/Magnitud_escalar" class="mw-redirect" title="Magnitud escalar">escalar</a> representat pel símbol <i>v</i> i que expressa quant varia la <a href="/wiki/Posici%C3%B3" title="Posició">posició</a>, sense tenir en compte el canvi d'orientació, en funció del <a href="/wiki/Temps" title="Temps">temps</a>. La <a href="/wiki/Velocitat" title="Velocitat">velocitat</a> és la suma de la variació de la posició, segons una trajectòria donada i que comportà una distància; però a més té en compte la variació d'orientació. El canvi d'orientació es diu <a href="/wiki/Velocitat_angular" title="Velocitat angular">velocitat angular</a>, no comporta un canvi de posició a l'espai sinó un canvi de com està encarat un cos, per exemple ho seria el moviment de balanceig a un costat i l'altre d'un vaixell amarrat. La velocitat angular només té sentit a la <a href="/wiki/Mec%C3%A0nica" title="Mecànica">mecànica</a> del <a href="/wiki/S%C3%B2lid_r%C3%ADgid" title="Sòlid rígid">sòlid rígid</a>, mentre que a la mecànica del punt, com aquest és unidimensional i no pot canviar d'orientació, aquesta resulta nul·la i, conseqüentment, coincideix amb el mòdul del vector velocitat. Quan es parla de <b><a href="/wiki/Velocitat" title="Velocitat">velocitat</a></b>, en realitat se sol parlar de celeritat, que indica el valor i el sentit de la primera (el mòdul del <a href="/wiki/Vector_(f%C3%ADsica)" title="Vector (física)">vector</a><sup id="cite_ref-celeritat-DIEC_2-0" class="reference"><a href="#cite_note-celeritat-DIEC-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>), però no la direcció. De forma equivalent, la celeritat és el valor absolut de la velocitat: </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathbf {v} ={\frac {\Delta \mathbf {x} }{\Delta \mathbf {t} }}=\left|{\vec {\mathbf {v} }}\right|}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">v</mi> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">Δ</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">x</mi> </mrow> </mrow> <mrow> <mi mathvariant="normal">Δ</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">t</mi> </mrow> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow> <mo>|</mo> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mover> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">v</mi> </mrow> <mo stretchy="false">→</mo> </mover> </mrow> </mrow> <mo>|</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathbf {v} ={\frac {\Delta \mathbf {x} }{\Delta \mathbf {t} }}=\left|{\vec {\mathbf {v} }}\right|}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a5949975438fe5237e32102694115c62b562a796" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:14.496ex; height:5.509ex;" alt="{\displaystyle \mathbf {v} ={\frac {\Delta \mathbf {x} }{\Delta \mathbf {t} }}=\left|{\vec {\mathbf {v} }}\right|}"></span> </p><p>I si la celeritat mesura el canvi del <a href="/wiki/Despla%C3%A7ament_(cinem%C3%A0tica)" title="Desplaçament (cinemàtica)">desplaçament</a> respecte del <a href="/wiki/Temps" title="Temps">temps</a>, el canvi de la celeritat respecte del temps és causat per l'<a href="/wiki/Acceleraci%C3%B3" title="Acceleració">acceleració</a>: </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathbf {a} ={\frac {d\mathbf {v} }{d\mathbf {t} }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">a</mi> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>d</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">v</mi> </mrow> </mrow> <mrow> <mi>d</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="bold">t</mi> </mrow> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathbf {a} ={\frac {d\mathbf {v} }{d\mathbf {t} }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/99b3835d46e749fae85ec832fc45358cce7bebc9" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:7.861ex; height:5.509ex;" alt="{\displaystyle \mathbf {a} ={\frac {d\mathbf {v} }{d\mathbf {t} }}}"></span> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Concepte">Concepte</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Celeritat&action=edit&section=1" title="Modifica la secció: Concepte"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El concepte de celeritat és molt important en la majoria de camps <a href="/wiki/Ci%C3%A8ncia" title="Ciència">científics</a> i <a href="/wiki/Tecnologia" title="Tecnologia">tecnològics</a>, i per extensió a la resta. Avui en dia seria impossible imaginar <a href="/wiki/Cotxe" class="mw-redirect" title="Cotxe">cotxes</a> sense <a href="/wiki/Veloc%C3%ADmetre" title="Velocímetre">velocímetres</a>, calcular el temps que trigaríem a arribar a un lloc o comprendre conceptes elementals com la <a href="/wiki/Gravetat" title="Gravetat">gravetat</a> o la <a href="/wiki/Temperatura" title="Temperatura">temperatura</a> sense la velocitat, i per tant sense la celeritat. </p><p>Cal destacar que abans d'<a href="/wiki/Albert_Einstein" title="Albert Einstein">Einstein</a> es considerava que la celeritat i la velocitat eren dependents del temps, que era la magnitud constant (sobretot a partir del sòlid model de <a href="/wiki/Isaac_Newton" title="Isaac Newton">Newton</a>). A partir de la <a href="/wiki/Teoria_de_la_Relativitat" class="mw-redirect" title="Teoria de la Relativitat">teoria de la Relativitat</a> d'Einstein es va descobrir que, en realitat, la celeritat de la llum era l'única constant, i que el temps i l'espai en depenien (i que no són constants), permetent un enorme avenç en camps com per exemple l'<a href="/wiki/Astronomia" title="Astronomia">astronomia</a>. </p><p>Més antigament, la velocitat, i en general el moviment, ha estat objecte d'estudi des de la <a href="/wiki/Gr%C3%A8cia_cl%C3%A0ssica" class="mw-redirect" title="Grècia clàssica">Grècia clàssica</a>, tant en la <a href="/wiki/Ci%C3%A8ncia" title="Ciència">ciència</a> com en la <a href="/wiki/Filosofia" title="Filosofia">filosofia</a>, passant pels grans científics investigadors com per exemple <a href="/wiki/Galileo_Galilei" title="Galileo Galilei">Galileu</a> (que estudiava la gravetat)<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> i d'altres astrònoms com <a href="/wiki/Nicolau_Cop%C3%A8rnic" title="Nicolau Copèrnic">Copèrnic</a> o <a href="/wiki/Johannes_Kepler" title="Johannes Kepler">Kepler</a>. Finalment, Newton va ser qui va acabar de donar forma a la física donant un cos matemàtic consistent en camps com la <a href="/wiki/Cinem%C3%A0tica" title="Cinemàtica">cinemàtica</a> i la <a href="/wiki/Din%C3%A0mica" title="Dinàmica">dinàmica</a>. </p><p>Aquests exemples mostren com és d'important el concepte de celeritat, i el de velocitat, que relacionen el temps i l'espai, els tres pilars de la <a href="/wiki/F%C3%ADsica" title="Física">física</a>. La seva comprensió profunda afecta dels nivells més elementals la matèria (la <a href="/wiki/Temperatura" title="Temperatura">temperatura</a> no és sinó <a href="/wiki/Energia_cin%C3%A8tica" title="Energia cinètica">energia cinètica</a> dels <a href="/wiki/%C3%80toms" class="mw-redirect" title="Àtoms">àtoms</a>), i per tant a través d'ells es comprèn l'estructura de la realitat i les lleis físiques que la governen. </p> <div class="mw-heading mw-heading2"><h2 id="Unitats">Unitats</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Celeritat&action=edit&section=2" title="Modifica la secció: Unitats"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La celeritat comparteix amb la velocitat la <a href="/wiki/Unitats_derivades_del_SI" title="Unitats derivades del SI">unitat derivada del Sistema Internacional</a> <a href="/wiki/Metre_per_segon" title="Metre per segon">metre per segon</a> o m/s (ms-1). Altres unitats de la celeritat (i de la velocitat) són: </p> <ul><li>quilòmetres per hora (km/h)<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></li> <li>milles per hora (<a href="/w/index.php?title=Milla_terrestre&action=edit&redlink=1" class="new" title="Milla terrestre (encara no existeix)">milles terrestres</a> per hora, sistema anglosaxó; 1 mph equival a 1,609 km/h)</li> <li>nus marí (<a href="/wiki/Milla_marina" title="Milla marina">milles marines</a> per hora, sistema anglosaxó; 1 nus equival a 1,852 km/h)</li> <li><a href="/wiki/Mach" class="mw-redirect" title="Mach">Mach</a> <i>n</i>, on Mach 1 és la <a href="/wiki/Velocitat_del_so" title="Velocitat del so">celeritat del so</a>, en condicions habituals, i <i>n</i> indica la proporció respecte a aquesta magnitud (343 m/s = 1234.8 km/h).</li> <li><a href="/wiki/Velocitat_de_la_llum" title="Velocitat de la llum">celeritat de la llum</a> o constant <i>c</i> (en el <a href="/wiki/Buit" title="Buit">buit</a>), que equival a 299.792.458 m/s.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Exemples">Exemples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Celeritat&action=edit&section=3" title="Modifica la secció: Exemples"><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:Snail.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Snail.jpg/220px-Snail.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Snail.jpg/330px-Snail.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Snail.jpg/440px-Snail.jpg 2x" data-file-width="2592" data-file-height="1944" /></a><figcaption>Els cargols sovint són utilitzats de manera figurada per descriure algú o quelcom que es mou extremament lent.</figcaption></figure> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:Lockheed_SR-71_Blackbird.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/97/Lockheed_SR-71_Blackbird.jpg/220px-Lockheed_SR-71_Blackbird.jpg" decoding="async" width="220" height="172" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/97/Lockheed_SR-71_Blackbird.jpg/330px-Lockheed_SR-71_Blackbird.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/97/Lockheed_SR-71_Blackbird.jpg/440px-Lockheed_SR-71_Blackbird.jpg 2x" data-file-width="5100" data-file-height="3996" /></a><figcaption>L'<a href="/wiki/SR-71_Blackbird" class="mw-redirect" title="SR-71 Blackbird">SR-71 Blackbird</a> va ser l'<a href="/wiki/Avi%C3%B3" title="Avió">avió</a> més ràpid del món durant tota la seva vida activa i el seu rècord encara no ha estat superat.<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><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></figcaption></figure> <ul><li>celeritat d'un <a href="/wiki/Gastr%C3%B2pode" class="mw-redirect" title="Gastròpode">caragol</a> comú = 0,001 ms-1; 0,004 km/h; 0,002 mph (1 <a href="/wiki/Mil%C2%B7l%C3%ADmetre" class="mw-redirect" title="Mil·límetre">mil·límetre</a> per <a href="/wiki/Segon" title="Segon">segon</a>).</li> <li>Una caminada ràpida = 1.7 ms-1; 6 km/h; 4 mph (5.5 peus per segon).</li> <li>Corredors <a href="/wiki/Jocs_Ol%C3%ADmpics" title="Jocs Olímpics">olímpics</a> (<a href="/wiki/Velocitat_mitjana" class="mw-redirect" title="Velocitat mitjana">velocitat mitjana</a> en la cursa de <a href="/wiki/100_metres_llisos" title="100 metres llisos">100 metres llisos</a>) = 10 ms-1; 36 km/h; 22 mph.</li> <li>Ascensor del <a href="/wiki/Taipei_101" title="Taipei 101">Taipei 101</a> = 1010 m/min; 16,7 ms-1; 60,6 km/h; 37,6 mph<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></li> <li>Límit de velocitat en una <a href="/wiki/Autopista" title="Autopista">autopista</a> francesa = 36 ms-1; 130 km/h; 80 mph.<sup id="cite_ref-fra-PTAC_9-0" class="reference"><a href="#cite_note-fra-PTAC-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></li> <li>Velocitat de creuer d'un <a href="/wiki/Boeing_747-8" title="Boeing 747-8">Boeing 747-8</a> = 290 ms-1; 917 km/h; 650 mph; (Mach 0.85)</li> <li>La velocitat del so a l'aire sec a la pressió de nivell del mar i 20 °C (293<a href="/wiki/Kelvin" title="Kelvin">K</a>) = 343 ms-1 ≈ 1235 km/h ≈ 768 mph (= Mach 1 per definició<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>).</li> <li>Rècord oficial de velocitat en l'aire = 980 ms-1; 3,530 km/h; 2.194 mph.</li> <li><a href="/wiki/Velocitat_d%27escapament" title="Velocitat d'escapament">Velocitat d'escapament</a> de la <a href="/wiki/Terra" title="Terra">Terra</a>: 11,2 km/s<sup id="cite_ref-EscapeVelocityData_11-0" class="reference"><a href="#cite_note-EscapeVelocityData-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Transbordador_espacial" title="Transbordador espacial">Transbordador espacial</a> en reentrada = 7,800 ms-1; 28,000 km/h; 17,500 mph.</li> <li>Velocitat mitjana d'<a href="/wiki/%C3%92rbita_de_la_Terra" class="mw-redirect" title="Òrbita de la Terra">òrbita de la Terra</a> = 29,783 ms-1; 107,218 km/h; 66,623 mph.</li> <li><a href="/wiki/Velocitat_de_la_llum" title="Velocitat de la llum">Velocitat de la llum</a> en el buit (símbol <i>c</i><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>) 299,792,458 ms-1 (per definició).</li></ul> <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=Celeritat&action=edit&section=4" 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.avl.gva.es/lexicval/mobile/?paraula=Rapidea">"Rapidea", variant normativa de "rapidesa" segons l'AVL</a>».  Acadèmia Valenciana de la Llengua. [Consulta: 5 abril 2018].</span></span> </li> <li id="cite_note-celeritat-DIEC-2"><span class="mw-cite-backlink"><a href="#cite_ref-celeritat-DIEC_2-0">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://dlc.iec.cat/results.asp?txtEntrada=celeritat&operEntrada=0">Entrada "celeritat"</a> al <a href="/wiki/Diccionari_de_la_llengua_catalana_de_l%27IEC" title="Diccionari de la llengua catalana de l'IEC">DIEC</a>.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><a href="/wiki/Galileo_Galilei" title="Galileo Galilei">Galileo Galilei</a>: <i>Discorsi e dimostrazioni matematiche intorno a due nuove scienze attinenti alla mecanica ed i movimenti locali</i>, Leiden 1638</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.bipm.org/en/si/si_brochure/">BIPM brochure</a> (SI reference) <style data-mw-deduplicate="TemplateStyles:r33711417">.mw-parser-output .languageicon{font-size:0.95em;color:#555;background-color:inherit}@media screen{html.skin-theme-clientpref-night .mw-parser-output .languageicon{background-color:inherit;color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .languageicon{background-color:inherit;color:white}}</style><span class="languageicon" title="En anglès">(anglès)</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" style="font-style:normal">«<a rel="nofollow" class="external text" href="https://web.archive.org/web/20070927002329/http://records.fai.org/general_aviation/current.asp?id1=21&id2=4">Records</a>». Arxivat de l'<a rel="nofollow" class="external text" href="http://records.fai.org/general_aviation/current.asp?id1=21&id2=4">original</a> el 2007-09-27. [Consulta: 15 agost 2009].</span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.wvi.com/~sr71webmaster/spd_run001.html">Altitude record</a></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="https://web.archive.org/web/20100729111021/http://records.fai.org/general_aviation/aircraft.asp?id=779">Record</a>». Arxivat de l'<a rel="nofollow" class="external text" href="http://records.fai.org/general_aviation/aircraft.asp?id=779">original</a> el 2010-07-29. [Consulta: 15 agost 2009].</span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><a href="#cite_ref-8">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.taipei-101.com.tw/en/OB/about/floor.asp">Taipei 101 Official Website - Observatory Floor Guide</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r33711417"><span class="languageicon" title="En anglès">(anglès)</span></span> </li> <li id="cite_note-fra-PTAC-9"><span class="mw-cite-backlink"><a href="#cite_ref-fra-PTAC_9-0">↑</a></span> <span class="reference-text"><a href="/wiki/Tara" class="mw-disambig" title="Tara">Tara</a> del vehicle <a href="/wiki/Tractor" title="Tractor">tractor</a> inferior a 3,5 tones i <a href="/w/index.php?title=Pes_total_de_c%C3%A0rrega&action=edit&redlink=1" class="new" title="Pes total de càrrega (encara no existeix)">PTC</a> del conjunt dels vehicles comprès entre 3,5 tones i 12 tones. <a rel="nofollow" class="external text" href="http://www.legifrance.gouv.fr/affichCodeArticle.do;jsessionid=4CEB1411C07F9D5AA88B49DED786AD24.tpdjo10v_2?idArticle=LEGIARTI000006842188&cidTexte=LEGITEXT000006074228&dateTexte=20090619">Art.R413-8 del <i>code de la route</i></a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r33711417"><span class="languageicon" title="En francès">(francès)</span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><a href="#cite_ref-10">↑</a></span> <span class="reference-text">Bodie, Warren M., <i>The Lockheed P-38 Lightning</i>, Widewing Publications <a href="/wiki/Especial:Fonts_bibliogr%C3%A0fiques/0-9629359-0-5" title="Especial:Fonts bibliogràfiques/0-9629359-0-5">ISBN 0-9629359-0-5</a></span> </li> <li id="cite_note-EscapeVelocityData-11"><span class="mw-cite-backlink"><a href="#cite_ref-EscapeVelocityData_11-0">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://hyperphysics.phy-astr.gsu.edu/hbase/solar/soldata2.html">Solar System Data</a>».  Universitat Estatal de Geòrgia. [Consulta: 21 gener 2007].</span> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r33711417"><span class="languageicon" title="En anglès">(anglès)</span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><a href="#cite_ref-12">↑</a></span> <span class="reference-text"><sup title="Cal donar format a aquesta referència." class="noprint"><span class="noprint" style="color:blue;"><i>[<a href="/wiki/VP:REF" class="mw-redirect" title="VP:REF">enllaç sense format</a>]</i></span></sup> <a rel="nofollow" class="external free" href="http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/c.html">http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/c.html</a></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Bibliografia">Bibliografia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Celeritat&action=edit&section=5" title="Modifica la secció: Bibliografia"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="citation book" style="font-style:normal" id="CITEREFFeynmanLeightonSands1963"><a href="/wiki/Richard_P._Feynman" class="mw-redirect" title="Richard P. Feynman"><span style="font-variant: small-caps;">Feynman</span>, Richard P.</a>; <span style="font-variant: small-caps;">Leighton</span>, Robert B.; <span style="font-variant: small-caps;">Sands</span>, Matthew. <i>The Feynman Lectures on Physics</i> (en anglès). 1.  Reading (Massachusetts): Addison-Wesley, 1963. <span style="font-size:90%; white-space:nowrap;"><a href="/wiki/Especial:Fonts_bibliogr%C3%A0fiques/0-201-02116-1" title="Especial:Fonts bibliogràfiques/0-201-02116-1">ISBN 0-201-02116-1</a></span>.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Feynman+Lectures+on+Physics&rft.aulast=Feynman&rft.aufirst=Richard+P.&rft.date=1963&rft.pub=Addison-Wesley&rft.place=Reading+%28Massachusetts%29&rft.isbn=0-201-02116-1"><span style="display: none;"> </span></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="Enllaços_externs"><span id="Enlla.C3.A7os_externs"></span>Enllaços externs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Celeritat&action=edit&section=6" title="Modifica la secció: Enllaços externs"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r33663753">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:#f9f9f9;display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}.mw-parser-output .side-box-center{clear:both;margin:auto}}</style><div class="side-box metadata side-box-right plainlinks"> <div class="side-box-flex"> <div class="side-box-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/40px-Wiktionary-logo.svg.png" decoding="async" width="40" height="38" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/60px-Wiktionary-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/80px-Wiktionary-logo.svg.png 2x" data-file-width="370" data-file-height="350" /></span></span></div> <div class="side-box-text plainlist">Vegeu <i><b><a href="https://ca.wiktionary.org/wiki/celeritat" class="extiw" title="wikt:celeritat">celeritat</a></b></i> en el <a href="https://ca.wiktionary.org/wiki/" class="extiw" title="wikt:">Viccionari</a>, el diccionari lliure.<span style="display: none;" class="interProject"><a href="https://ca.wiktionary.org/wiki/celeritat" class="extiw" title="wikt:celeritat">Viccionari</a></span></div></div> </div> <ul><li><a rel="nofollow" class="external text" href="http://www.edu365.cat/eso/muds/ciencies/problemes/cinematica1/cinematica.htm">Web sobre cinemàtica</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090423030202/http://www.edu365.cat/eso/muds/ciencies/problemes/cinematica1/cinematica.htm">Arxivat</a> 2009-04-23 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.: velocitat, rapidesa i celeritat</li> <li><a rel="nofollow" class="external text" href="http://www.edu365.cat/aulanet/comsoc/Lab_fisica/fisica_glossari.htm">Glossari de física</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20091204140728/http://www.edu365.cat/aulanet/comsoc/Lab_fisica/fisica_glossari.htm">Arxivat</a> 2009-12-04 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. amb terminologia referent a la celeritat i conceptes relacionats</li> <li><a rel="nofollow" class="external text" href="http://www.unitsconversion.com.ar/speedunitsconversion/">Convertidor d'unitats de celeritat en línia</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20201004052548/http://www.unitsconversion.com.ar/speedunitsconversion/">Arxivat</a> 2020-10-04 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r33711417"><span class="languageicon" title="En anglès">(anglès)</span></li> <li><a rel="nofollow" class="external text" href="http://kph.com/">Convertidor de km/h en mph</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r33711417"><span class="languageicon" title="En anglès">(anglès)</span></li> <li><a rel="nofollow" class="external text" href="http://www.physik.uni-muenchen.de/leifiphysik/web_ph08/m04_geschwindigkeit.htm">Experiments i exercicis sobre la celeritat</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20060115151644/http://www.physik.uni-muenchen.de/leifiphysik/web_ph08/m04_geschwindigkeit.htm">Arxivat</a> 2006-01-15 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r33711417"><span class="languageicon" title="En alemany">(alemany)</span></li></ul> <div role="navigation" class="navbox" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Control_d%27autoritats" title="Control d'autoritats">Registres d'autoritat</a></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"> <ul><li><a href="/wiki/Gemeinsame_Normdatei" title="Gemeinsame Normdatei">GND</a> <span class="uid"> (<a 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