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Costante di Stefan-Boltzmann - Wikipedia
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Disponibile in 36 lingue" > <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-36" 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">36 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AB%D8%A7%D8%A8%D8%AA_%D8%B3%D8%AA%D9%8A%D9%81%D8%A7%D9%86-%D8%A8%D9%88%D9%84%D8%AA%D8%B2%D9%85%D8%A7%D9%86" title="ثابت ستيفان-بولتزمان - arabo" lang="ar" hreflang="ar" data-title="ثابت ستيفان-بولتزمان" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D0%B0%D1%81%D1%82%D0%B0%D1%8F%D0%BD%D0%BD%D0%B0%D1%8F_%D0%A1%D1%82%D1%8D%D1%84%D0%B0%D0%BD%D0%B0_%E2%80%94_%D0%91%D0%BE%D0%BB%D1%8C%D1%86%D0%BC%D0%B0%D0%BD%D0%B0" title="Пастаянная Стэфана — Больцмана - bielorusso" lang="be" hreflang="be" data-title="Пастаянная Стэфана — Больцмана" data-language-autonym="Беларуская" data-language-local-name="bielorusso" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9A%D0%BE%D0%BD%D1%81%D1%82%D0%B0%D0%BD%D1%82%D0%B0_%D0%BD%D0%B0_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%E2%80%93_%D0%91%D0%BE%D0%BB%D1%86%D0%BC%D0%B0%D0%BD" title="Константа на Стефан – Болцман - bulgaro" lang="bg" hreflang="bg" data-title="Константа на Стефан – Болцман" data-language-autonym="Български" data-language-local-name="bulgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A7%8D%E0%A6%9F%E0%A6%BF%E0%A6%AB%E0%A7%87%E0%A6%A8-%E0%A6%AC%E0%A7%8B%E0%A6%B2%E0%A7%8D%E0%A6%9F%E0%A6%B8%E0%A6%AE%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%A8_%E0%A6%A7%E0%A7%8D%E0%A6%B0%E0%A7%81%E0%A6%AC%E0%A6%95" title="স্টিফেন-বোল্টসম্যান ধ্রুবক - bengalese" lang="bn" hreflang="bn" data-title="স্টিফেন-বোল্টসম্যান ধ্রুবক" data-language-autonym="বাংলা" data-language-local-name="bengalese" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Constant_de_Stefan-Boltzmann" title="Constant de Stefan-Boltzmann - catalano" lang="ca" hreflang="ca" data-title="Constant de Stefan-Boltzmann" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Stefanova%E2%80%93Boltzmannova_konstanta" title="Stefanova–Boltzmannova konstanta - ceco" lang="cs" hreflang="cs" data-title="Stefanova–Boltzmannova konstanta" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Stefan-Boltzmanns_konstant" title="Stefan-Boltzmanns konstant - danese" lang="da" hreflang="da" data-title="Stefan-Boltzmanns konstant" data-language-autonym="Dansk" data-language-local-name="danese" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Stefan-Boltzmann-Konstante" title="Stefan-Boltzmann-Konstante - tedesco" lang="de" hreflang="de" data-title="Stefan-Boltzmann-Konstante" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el badge-Q70893996 mw-list-item" title=""><a href="https://el.wikipedia.org/wiki/%CE%A3%CF%84%CE%B1%CE%B8%CE%B5%CF%81%CE%AC_%CE%A3%CF%84%CE%AD%CF%86%CE%B1%CE%BD-%CE%9C%CF%80%CF%8C%CE%BB%CF%84%CE%B6%CE%BC%CE%B1%CE%BD" title="Σταθερά Στέφαν-Μπόλτζμαν - greco" lang="el" hreflang="el" data-title="Σταθερά Στέφαν-Μπόλτζμαν" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en badge-Q70893996 mw-list-item" title=""><a href="https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant" title="Stefan–Boltzmann constant - inglese" lang="en" hreflang="en" data-title="Stefan–Boltzmann constant" data-language-autonym="English" data-language-local-name="inglese" 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/Konstanto_de_Stefan-Boltzmann" title="Konstanto de Stefan-Boltzmann - esperanto" lang="eo" hreflang="eo" data-title="Konstanto de Stefan-Boltzmann" 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/Constante_de_Stefan-Boltzmann" title="Constante de Stefan-Boltzmann - spagnolo" lang="es" hreflang="es" data-title="Constante de Stefan-Boltzmann" data-language-autonym="Español" data-language-local-name="spagnolo" 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/Stefani-Boltzmanni_konstant" title="Stefani-Boltzmanni konstant - estone" lang="et" hreflang="et" data-title="Stefani-Boltzmanni konstant" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AB%D8%A7%D8%A8%D8%AA_%D8%A7%D8%B4%D8%AA%D9%81%D8%A7%D9%86%E2%80%93%D8%A8%D9%88%D9%84%D8%AA%D8%B3%D9%85%D8%A7%D9%86" title="ثابت اشتفان–بولتسمان - persiano" lang="fa" hreflang="fa" data-title="ثابت اشتفان–بولتسمان" data-language-autonym="فارسی" data-language-local-name="persiano" 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/Stefanin%E2%80%93Boltzmannin_vakio" title="Stefanin–Boltzmannin vakio - finlandese" lang="fi" hreflang="fi" data-title="Stefanin–Boltzmannin vakio" data-language-autonym="Suomi" data-language-local-name="finlandese" 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/Constante_de_Stefan-Boltzmann" title="Constante de Stefan-Boltzmann - francese" lang="fr" hreflang="fr" data-title="Constante de Stefan-Boltzmann" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%8D%E0%A4%9F%E0%A5%87%E0%A4%AB%E0%A4%BC%E0%A4%BE%E0%A4%A8-%E0%A4%AC%E0%A5%8B%E0%A4%B2%E0%A5%8D%E0%A4%9F%E0%A5%8D%E0%A4%9C%E0%A4%BC%E0%A4%AE%E0%A4%BE%E0%A4%A8_%E0%A4%A8%E0%A4%BF%E0%A4%AF%E0%A4%A4%E0%A4%BE%E0%A4%82%E0%A4%95" title="स्टेफ़ान-बोल्ट्ज़मान नियतांक - hindi" lang="hi" hreflang="hi" data-title="स्टेफ़ान-बोल्ट्ज़मान नियतांक" 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/Stefan%E2%80%93Boltzmannova_konstanta" title="Stefan–Boltzmannova konstanta - croato" lang="hr" hreflang="hr" data-title="Stefan–Boltzmannova konstanta" data-language-autonym="Hrvatski" data-language-local-name="croato" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8D%D5%BF%D5%A5%D6%86%D5%A1%D5%B6-%D4%B2%D5%B8%D5%AC%D6%81%D5%B4%D5%A1%D5%B6%D5%AB_%D5%B0%D5%A1%D5%BD%D5%BF%D5%A1%D5%BF%D5%B8%D6%82%D5%B6" title="Ստեֆան-Բոլցմանի հաստատուն - armeno" lang="hy" hreflang="hy" data-title="Ստեֆան-Բոլցմանի հաստատուն" data-language-autonym="Հայերեն" data-language-local-name="armeno" 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/Konstanta_Stefan%E2%80%93Boltzmann" title="Konstanta Stefan–Boltzmann - indonesiano" lang="id" hreflang="id" data-title="Konstanta Stefan–Boltzmann" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%8A%88%ED%85%8C%ED%8C%90-%EB%B3%BC%EC%B8%A0%EB%A7%8C_%EC%83%81%EC%88%98" title="슈테판-볼츠만 상수 - coreano" lang="ko" hreflang="ko" data-title="슈테판-볼츠만 상수" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Stefana%E2%80%94Bolcma%C5%86a_konstante" title="Stefana—Bolcmaņa konstante - lettone" lang="lv" hreflang="lv" data-title="Stefana—Bolcmaņa konstante" data-language-autonym="Latviešu" data-language-local-name="lettone" 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%A8%D1%82%D0%B5%D1%84%D0%B0%D0%BD-%D0%91%D0%BE%D0%BB%D1%86%D0%BC%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0_%D0%BA%D0%BE%D0%BD%D1%81%D1%82%D0%B0%D0%BD%D1%82%D0%B0" title="Штефан-Болцманова константа - macedone" lang="mk" hreflang="mk" data-title="Штефан-Болцманова константа" data-language-autonym="Македонски" data-language-local-name="macedone" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Constante_van_Stefan-Boltzmann" title="Constante van Stefan-Boltzmann - olandese" lang="nl" hreflang="nl" data-title="Constante van Stefan-Boltzmann" data-language-autonym="Nederlands" data-language-local-name="olandese" 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/Stefan-Boltzmann-konstanten" title="Stefan-Boltzmann-konstanten - norvegese nynorsk" lang="nn" hreflang="nn" data-title="Stefan-Boltzmann-konstanten" data-language-autonym="Norsk nynorsk" data-language-local-name="norvegese 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/Stefan-Boltzmanns_konstant" title="Stefan-Boltzmanns konstant - norvegese bokmål" lang="nb" hreflang="nb" data-title="Stefan-Boltzmanns konstant" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Sta%C5%82a_Stefana-Boltzmanna" title="Stała Stefana-Boltzmanna - polacco" lang="pl" hreflang="pl" data-title="Stała Stefana-Boltzmanna" data-language-autonym="Polski" data-language-local-name="polacco" 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/Constante_de_Stefan%E2%80%93Boltzmann" title="Constante de Stefan–Boltzmann - portoghese" lang="pt" hreflang="pt" data-title="Constante de Stefan–Boltzmann" data-language-autonym="Português" data-language-local-name="portoghese" 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/Constanta_Stefan-Boltzmann" title="Constanta Stefan-Boltzmann - rumeno" lang="ro" hreflang="ro" data-title="Constanta Stefan-Boltzmann" data-language-autonym="Română" data-language-local-name="rumeno" 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%9F%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%BD%D0%B0%D1%8F_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD%D0%B0_%E2%80%94_%D0%91%D0%BE%D0%BB%D1%8C%D1%86%D0%BC%D0%B0%D0%BD%D0%B0" title="Постоянная Стефана — Больцмана - russo" lang="ru" hreflang="ru" data-title="Постоянная Стефана — Больцмана" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Stefan%E2%80%93Boltzmannova_konstanta" title="Stefan–Boltzmannova konstanta - serbo-croato" lang="sh" hreflang="sh" data-title="Stefan–Boltzmannova konstanta" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croato" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Stefanova_konstanta" title="Stefanova konstanta - sloveno" lang="sl" hreflang="sl" data-title="Stefanova konstanta" data-language-autonym="Slovenščina" data-language-local-name="sloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Stefan%E2%80%93Boltzmanns_konstant" title="Stefan–Boltzmanns konstant - svedese" lang="sv" hreflang="sv" data-title="Stefan–Boltzmanns konstant" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Stefan-Boltzmann_sabiti" title="Stefan-Boltzmann sabiti - turco" lang="tr" hreflang="tr" data-title="Stefan-Boltzmann sabiti" data-language-autonym="Türkçe" data-language-local-name="turco" 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%D1%82%D0%B0%D0%BB%D0%B0_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD%D0%B0_%E2%80%94_%D0%91%D0%BE%D0%BB%D1%8C%D1%86%D0%BC%D0%B0%D0%BD%D0%B0" title="Стала Стефана — Больцмана - ucraino" lang="uk" hreflang="uk" data-title="Стала Стефана — Больцмана" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%96%AF%E7%89%B9%E8%97%A9-%E7%8E%BB%E7%88%BE%E8%8C%B2%E6%9B%BC%E5%B8%B8%E6%95%B8" title="斯特藩-玻爾茲曼常數 - cinese" lang="zh" hreflang="zh" data-title="斯特藩-玻爾茲曼常數" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit 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class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><p>La <b>costante di Stefan-Boltzmann</b> (o <b>costante di Stefan</b>) è una <a href="/wiki/Costante_fisica" title="Costante fisica">costante fisica</a> denotata con la <a href="/wiki/Sigma_(lettera_greca)" class="mw-redirect" title="Sigma (lettera greca)">lettera greca σ</a>, e che rappresenta la <a href="/wiki/Proporzionalit%C3%A0_(matematica)" title="Proporzionalità (matematica)">costante di proporzionalità</a> nella <a href="/wiki/Legge_di_Stefan-Boltzmann" title="Legge di Stefan-Boltzmann">legge di Stefan-Boltzmann</a>: l'<a href="/wiki/Energia" title="Energia">energia</a> totale irradiata al secondo per unità di superficie (detta <a href="/wiki/Emittanza" title="Emittanza">emittanza</a>) di un <a href="/wiki/Corpo_nero" title="Corpo nero">corpo nero</a> è proporzionale alla quarta potenza della <a href="/wiki/Temperatura_assoluta" title="Temperatura assoluta">temperatura assoluta</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Valore">Valore</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&veaction=edit&section=1" title="Modifica la sezione Valore" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&action=edit&section=1" title="Edit section's source code: Valore"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Il valore della costante <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 \sigma }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>σ<!-- σ --></mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \sigma }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/59f59b7c3e6fdb1d0365a494b81fb9a696138c36" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle \sigma }"></span>, raccomandato da <a href="/wiki/CODATA" class="mw-redirect" title="CODATA">CODATA 2022</a>, è:<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> </p> <dl><dd><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 5{,}670374419...\cdot 10^{-8}\mathrm {\ {\frac {W}{m^{2}\cdot K^{4}}}} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>5,670</mn> <mn>374419...</mn> <mo>⋅<!-- ⋅ --></mo> <msup> <mn>10</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>−<!-- − --></mo> <mn>8</mn> </mrow> </msup> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi mathvariant="normal">W</mi> <mrow> <msup> <mi mathvariant="normal">m</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>⋅<!-- ⋅ --></mo> <msup> <mi mathvariant="normal">K</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msup> </mrow> </mfrac> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 5{,}670374419...\cdot 10^{-8}\mathrm {\ {\frac {W}{m^{2}\cdot K^{4}}}} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/99928c79426029f582b0c7a458126bcd430494d7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:29.497ex; height:5.343ex;" alt="{\displaystyle 5{,}670374419...\cdot 10^{-8}\mathrm {\ {\frac {W}{m^{2}\cdot K^{4}}}} }"></span></dd></dl> <p>Il valore raccomandato da <a href="/wiki/CODATA" class="mw-redirect" title="CODATA">CODATA</a> è calcolato a partire dalla misura della <a href="/wiki/Costante_dei_gas" title="Costante dei gas">costante dei gas</a> e dal <a href="/wiki/Costante_di_Avogadro" title="Costante di Avogadro">numero di Avogadro</a>: </p> <dl><dd><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 \sigma ={\frac {2\pi ^{5}R^{4}}{15h^{3}c^{2}N_{\rm {A}}^{4}}}\left(={\frac {32\pi ^{5}hR^{4}R_{\infty }^{4}}{15A_{\rm {r}}^{4}({\rm {e}})M_{\rm {u}}^{4}c^{6}\alpha ^{8}}}\right)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>σ<!-- σ --></mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>2</mn> <msup> <mi>π<!-- π --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>5</mn> </mrow> </msup> <msup> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msup> </mrow> <mrow> <mn>15</mn> <msup> <mi>h</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> </msup> <msup> <mi>c</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">A</mi> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> <mrow> <mo>(</mo> <mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>32</mn> <msup> <mi>π<!-- π --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>5</mn> </mrow> </msup> <mi>h</mi> <msup> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msup> <msubsup> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">∞<!-- ∞ --></mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msubsup> </mrow> <mrow> <mn>15</mn> <msubsup> <mi>A</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">r</mi> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msubsup> <mo stretchy="false">(</mo> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">e</mi> </mrow> </mrow> <mo stretchy="false">)</mo> <msubsup> <mi>M</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">u</mi> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msubsup> <msup> <mi>c</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>6</mn> </mrow> </msup> <msup> <mi>α<!-- α --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>8</mn> </mrow> </msup> </mrow> </mfrac> </mrow> </mrow> <mo>)</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \sigma ={\frac {2\pi ^{5}R^{4}}{15h^{3}c^{2}N_{\rm {A}}^{4}}}\left(={\frac {32\pi ^{5}hR^{4}R_{\infty }^{4}}{15A_{\rm {r}}^{4}({\rm {e}})M_{\rm {u}}^{4}c^{6}\alpha ^{8}}}\right)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/98c5b9e4c83464d18bb53e2e7815de4dbd02682e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:38.852ex; height:7.509ex;" alt="{\displaystyle \sigma ={\frac {2\pi ^{5}R^{4}}{15h^{3}c^{2}N_{\rm {A}}^{4}}}\left(={\frac {32\pi ^{5}hR^{4}R_{\infty }^{4}}{15A_{\rm {r}}^{4}({\rm {e}})M_{\rm {u}}^{4}c^{6}\alpha ^{8}}}\right)}"></span></dd></dl> <p>dove: </p> <ul><li><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 R}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4b0bfb3769bf24d80e15374dc37b0441e2616e33" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.764ex; height:2.176ex;" alt="{\displaystyle R}"></span> è la <a href="/wiki/Costante_dei_gas" title="Costante dei gas">costante dei gas</a>,</li> <li><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 N_{A}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>A</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N_{A}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9fa9233ef6a6a2c0576dbf65490ddb8307fde494" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.331ex; height:2.509ex;" alt="{\displaystyle N_{A}}"></span> è il <a href="/wiki/Numero_di_Avogadro" class="mw-redirect" title="Numero di Avogadro">numero di Avogadro</a>,</li> <li><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 R_{\infty }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">∞<!-- ∞ --></mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R_{\infty }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/639146705058e9d335aed47b55a9f802bc290b5f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.639ex; height:2.509ex;" alt="{\displaystyle R_{\infty }}"></span> è la <a href="/wiki/Costante_di_Rydberg" title="Costante di Rydberg">costante di Rydberg</a>,</li> <li><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 A_{r}(e)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>A</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>r</mi> </mrow> </msub> <mo stretchy="false">(</mo> <mi>e</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A_{r}(e)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/41fe9ac1fa817a63b5b048e3f0683ccacac50a89" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:5.61ex; height:2.843ex;" alt="{\displaystyle A_{r}(e)}"></span> è la <a href="/wiki/Massa_atomica_relativa" title="Massa atomica relativa">massa atomica relativa</a> dell'<a href="/wiki/Elettrone" title="Elettrone">elettrone</a>,</li> <li><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 M_{u}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>M</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>u</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle M_{u}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a72cd86dcb2d52a1e3d92d3c5789978abc7f1f4c" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.427ex; height:2.509ex;" alt="{\displaystyle M_{u}}"></span> è la <i>costante di massa molare</i> (che per definizione vale 1 g/mol),</li> <li><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 \alpha }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>α<!-- α --></mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \alpha }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b79333175c8b3f0840bfb4ec41b8072c83ea88d3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.488ex; height:1.676ex;" alt="{\displaystyle \alpha }"></span> è la <a href="/wiki/Costante_di_struttura_fine" title="Costante di struttura fine">costante di struttura fine</a>.</li></ul> <p>Il valore è derivabile sia per via analitica che per via sperimentale. Il valore di <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 \sigma }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>σ<!-- σ --></mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \sigma }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/59f59b7c3e6fdb1d0365a494b81fb9a696138c36" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle \sigma }"></span> può essere definito in termini della <a href="/wiki/Costante_di_Boltzmann" title="Costante di Boltzmann">costante di Boltzmann</a> <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 k_{\mathrm {B} }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">B</mi> </mrow> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle k_{\mathrm {B} }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c9b90d21a1c8fb907fddab1caded3b7f1eeffe3d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.607ex; height:2.509ex;" alt="{\displaystyle k_{\mathrm {B} }}"></span> come: </p> <dl><dd><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 \sigma ={\frac {2\pi ^{5}k_{\mathrm {B} }^{4}}{15h^{3}c^{2}}}={\frac {\pi ^{2}k_{\mathrm {B} }^{4}}{60\hbar ^{3}c^{2}}},}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>σ<!-- σ --></mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>2</mn> <msup> <mi>π<!-- π --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>5</mn> </mrow> </msup> <msubsup> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">B</mi> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msubsup> </mrow> <mrow> <mn>15</mn> <msup> <mi>h</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> </msup> <msup> <mi>c</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mi>π<!-- π --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">B</mi> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msubsup> </mrow> <mrow> <mn>60</mn> <msup> <mi class="MJX-variant">ℏ<!-- ℏ --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> </msup> <msup> <mi>c</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \sigma ={\frac {2\pi ^{5}k_{\mathrm {B} }^{4}}{15h^{3}c^{2}}}={\frac {\pi ^{2}k_{\mathrm {B} }^{4}}{60\hbar ^{3}c^{2}}},}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b71e0e02affa6b8fc15221022da155f9464174f9" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.171ex; width:23.387ex; height:6.343ex;" alt="{\displaystyle \sigma ={\frac {2\pi ^{5}k_{\mathrm {B} }^{4}}{15h^{3}c^{2}}}={\frac {\pi ^{2}k_{\mathrm {B} }^{4}}{60\hbar ^{3}c^{2}}},}"></span></dd></dl> <p>dove: </p> <ul><li><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 h}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>h</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle h}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b26be3e694314bc90c3215047e4a2010c6ee184a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.339ex; height:2.176ex;" alt="{\displaystyle h}"></span> è la <a href="/wiki/Costante_di_Planck" title="Costante di Planck">costante di Planck</a>,</li> <li><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 \hbar =h/2\pi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi class="MJX-variant">ℏ<!-- ℏ --></mi> <mo>=</mo> <mi>h</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>2</mn> <mi>π<!-- π --></mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \hbar =h/2\pi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f836f3a2de168369eb9f80f4057518222ecde88b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:9.401ex; height:2.843ex;" alt="{\displaystyle \hbar =h/2\pi }"></span> è la costante di Planck ridotta,</li> <li><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 c}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>c</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle c}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/86a67b81c2de995bd608d5b2df50cd8cd7d92455" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.007ex; height:1.676ex;" alt="{\displaystyle c}"></span> è la <a href="/wiki/Velocit%C3%A0_della_luce" title="Velocità della luce">velocità della luce</a> nel <a href="/wiki/Vuoto_(fisica)" title="Vuoto (fisica)">vuoto</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Storia">Storia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&veaction=edit&section=2" title="Modifica la sezione Storia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&action=edit&section=2" title="Edit section's source code: Storia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La legge fu scoperta sperimentalmente da <a href="/wiki/Josef_Stefan" title="Josef Stefan">Josef Stefan</a> nel <a href="/wiki/1879" title="1879">1879</a> e in seguito spiegata teoricamente per la prima volta da <a href="/wiki/Ludwig_Boltzmann" title="Ludwig Boltzmann">Ludwig Boltzmann</a> nel <a href="/wiki/1884" title="1884">1884</a>.<sup id="cite_ref-Britannica_2-0" class="reference"><a href="#cite_note-Britannica-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Nella trattazione contemporanea è ricondotta alla <a href="/wiki/Legge_di_Planck" title="Legge di Planck">legge di Planck</a>, <a href="/wiki/Integrale" title="Integrale">integrando</a> su tutte le lunghezze d'onda ad una data temperatura. La costante di Stefan-Boltzmann può essere utilizzata per misurare la quantità di calore che viene emessa da un <a href="/wiki/Corpo_nero" title="Corpo nero">corpo nero</a>, che assorbe tutta l'energia radiante che lo colpisce ed emette tutta l'energia radiante (<a href="/wiki/Assorbivit%C3%A0" class="mw-redirect" title="Assorbività">assorbività</a> = 1, <a href="/wiki/Emissivit%C3%A0" title="Emissività">emissività</a> = 1). </p> <div class="mw-heading mw-heading2"><h2 id="Costante_di_radiazione">Costante di radiazione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&veaction=edit&section=3" title="Modifica la sezione Costante di radiazione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&action=edit&section=3" title="Edit section's source code: Costante di radiazione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Una costante correlata è la <b>costante di radiazione</b> <b>a</b> (o <b>costante di densità di radiazione</b>), che è data da:<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> </p> <dl><dd><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 a={\frac {4\sigma }{c}}=7{,}5657\times 10^{-16}\,{\textrm {J}}\,{\textrm {m}}^{-3}\,{\textrm {K}}^{-4}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>a</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>4</mn> <mi>σ<!-- σ --></mi> </mrow> <mi>c</mi> </mfrac> </mrow> <mo>=</mo> <mn>7,565</mn> <mn>7</mn> <mo>×<!-- × --></mo> <msup> <mn>10</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>−<!-- − --></mo> <mn>16</mn> </mrow> </msup> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mtext>J</mtext> </mrow> </mrow> <mspace width="thinmathspace" /> <msup> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mtext>m</mtext> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mo>−<!-- − --></mo> <mn>3</mn> </mrow> </msup> <mspace width="thinmathspace" /> <msup> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mtext>K</mtext> </mrow> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mo>−<!-- − --></mo> <mn>4</mn> </mrow> </msup> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a={\frac {4\sigma }{c}}=7{,}5657\times 10^{-16}\,{\textrm {J}}\,{\textrm {m}}^{-3}\,{\textrm {K}}^{-4}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7d9198075ed3fef35a564072e3e78c411da852a6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:36.947ex; height:5.176ex;" alt="{\displaystyle a={\frac {4\sigma }{c}}=7{,}5657\times 10^{-16}\,{\textrm {J}}\,{\textrm {m}}^{-3}\,{\textrm {K}}^{-4}.}"></span></dd></dl> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&veaction=edit&section=4" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&action=edit&section=4" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text"><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="https://physics.nist.gov/cgi-bin/cuu/Value?sigma"><span style="font-style:italic;">Stefan-Boltzmann constant</span></a>, su <span style="font-style:italic;">physics.nist.gov</span>.</cite></span> </li> <li id="cite_note-Britannica-2"><a href="#cite_ref-Britannica_2-0"><b>^</b></a> <span class="reference-text"><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="https://www.britannica.com/EBchecked/topic/564843/Stefan-Boltzmann-law"><span style="font-style:italic;">Stephan-Boltzmann Law</span></a>, su <span style="font-style:italic;">britannica.com</span>, Encyclopedia Britannica.</cite></span> </li> <li id="cite_note-3"><a href="#cite_ref-3"><b>^</b></a> <span class="reference-text"><a rel="nofollow" class="external text" href="http://scienceworld.wolfram.com/physics/RadiationConstant.html">Radiation constant</a> from ScienceWorld</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&veaction=edit&section=5" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Costante_di_Stefan-Boltzmann&action=edit&section=5" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; color: black; font-weight: bold; margin: 0"><span>Altri progetti</span></p><ul title="Collegamenti verso gli altri progetti Wikimedia"> <li class="" title=""><span class="plainlinks" title="commons:Category:Stefan–Boltzmann constant"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Stefan%E2%80%93Boltzmann_constant?uselang=it">Wikimedia Commons</a></span></li></ul></div> <ul><li><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/?uselang=it" title="Collabora a Wikimedia Commons"><img alt="Collabora a Wikimedia Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png" decoding="async" width="18" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/27px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/36px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/?uselang=it">Wikimedia Commons</a></span> contiene immagini o altri file su <b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Stefan%E2%80%93Boltzmann_constant?uselang=it">costante di Stefan-Boltzmann</a></span></b></li></ul> <style data-mw-deduplicate="TemplateStyles:r141815314">.mw-parser-output .navbox{border:1px solid #aaa;clear:both;margin:auto;padding:2px;width:100%}.mw-parser-output .navbox th{padding-left:1em;padding-right:1em;text-align:center}.mw-parser-output .navbox>tbody>tr:first-child>th{background:#ccf;font-size:90%;width:100%;color:var(--color-base,black)}.mw-parser-output .navbox_navbar{float:left;margin:0;padding:0 10px 0 0;text-align:left;width:6em}.mw-parser-output .navbox_title{font-size:110%}.mw-parser-output .navbox_abovebelow{background:#ddf;font-size:90%;font-weight:normal}.mw-parser-output .navbox_group{background:#ddf;font-size:90%;padding:0 10px;white-space:nowrap}.mw-parser-output .navbox_list{font-size:90%;width:100%}.mw-parser-output .navbox_list a{white-space:nowrap}html:not(.vector-feature-night-mode-enabled) .mw-parser-output .navbox_odd{background:#fdfdfd;color:var(--color-base,black)}html:not(.vector-feature-night-mode-enabled) .mw-parser-output .navbox_even{background:#f7f7f7;color:var(--color-base,black)}.mw-parser-output .navbox a.mw-selflink{color:var(--color-base,black)}.mw-parser-output .navbox_center{text-align:center}.mw-parser-output .navbox .navbox_image{padding-left:7px;vertical-align:middle;width:0}.mw-parser-output .navbox+.navbox{margin-top:-1px}.mw-parser-output .navbox .mw-collapsible-toggle{font-weight:normal;text-align:right;width:7em}body.skin--responsive .mw-parser-output .navbox_image img{max-width:none!important}.mw-parser-output .subnavbox{margin:-3px;width:100%}.mw-parser-output .subnavbox_group{background:#e6e6ff;padding:0 10px}@media screen{html.skin-theme-clientpref-night .mw-parser-output .navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-night .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-night .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-night .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-night .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-os .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-os .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}</style><table class="navbox mw-collapsible mw-collapsed noprint metadata" id="navbox-Unità_di_misura"><tbody><tr><th colspan="2"><div class="navbox_navbar"><div class="noprint plainlinks" style="background-color:transparent; 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width:22%;"><a href="/wiki/Sistema_internazionale_di_unit%C3%A0_di_misura" title="Sistema internazionale di unità di misura">Sistema internazionale</a></th><td colspan="1" class="navbox_list navbox_odd"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Unit%C3%A0_fondamentali_del_sistema_internazionale" title="Unità fondamentali del sistema internazionale">Unità di base</a></th><td colspan="1"><a href="/wiki/Secondo" title="Secondo">secondo</a><b> ·</b> <a href="/wiki/Metro" title="Metro">metro</a><b> ·</b> <a href="/wiki/Chilogrammo" title="Chilogrammo">chilogrammo</a><b> ·</b> <a href="/wiki/Ampere" title="Ampere">ampere</a><b> ·</b> <a href="/wiki/Kelvin" title="Kelvin">kelvin</a><b> ·</b> <a href="/wiki/Mole" title="Mole">mole</a><b> ·</b> <a href="/wiki/Candela_(unit%C3%A0_di_misura)" title="Candela (unità di misura)">candela</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità derivate</th><td colspan="1"><a href="/wiki/Hertz" title="Hertz">hertz</a><b> ·</b> <a href="/wiki/Newton_(unit%C3%A0_di_misura)" title="Newton (unità di misura)">newton</a><b> ·</b> <a href="/wiki/Pascal_(unit%C3%A0_di_misura)" title="Pascal (unità di misura)">pascal</a><b> ·</b> <a href="/wiki/Joule" title="Joule">joule</a><b> ·</b> <a href="/wiki/Watt" title="Watt">watt</a><b> ·</b> <a href="/wiki/Coulomb" title="Coulomb">coulomb</a><b> ·</b> <a href="/wiki/Volt" title="Volt">volt</a><b> ·</b> <a href="/wiki/Ohm" title="Ohm">ohm</a><b> ·</b> <a href="/wiki/Siemens_(unit%C3%A0_di_misura)" title="Siemens (unità di misura)">siemens</a><b> ·</b> <a href="/wiki/Farad" title="Farad">farad</a><b> ·</b> <a href="/wiki/Tesla_(unit%C3%A0_di_misura)" title="Tesla (unità di misura)">tesla</a><b> ·</b> <a href="/wiki/Weber_(unit%C3%A0_di_misura)" title="Weber (unità di misura)">weber</a><b> ·</b> <a href="/wiki/Henry_(unit%C3%A0_di_misura)" title="Henry (unità di misura)">henry</a><b> ·</b> <a href="/wiki/Grado_Celsius" title="Grado Celsius">grado Celsius</a><b> ·</b> <a href="/wiki/Radiante" title="Radiante">radiante</a><b> ·</b> <a href="/wiki/Steradiante" title="Steradiante">steradiante</a><b> ·</b> <a href="/wiki/Lumen" title="Lumen">lumen</a><b> ·</b> <a href="/wiki/Lux" title="Lux">lux</a><b> ·</b> <a href="/wiki/Becquerel" title="Becquerel">becquerel</a><b> ·</b> <a href="/wiki/Gray_(unit%C3%A0_di_misura)" title="Gray (unità di misura)">gray</a><b> ·</b> <a href="/wiki/Sievert" title="Sievert">sievert</a><b> ·</b> <a href="/wiki/Katal" title="Katal">katal</a></td></tr></tbody></table></td></tr><tr><th colspan="1" class="navbox_group" style="text-align:center; width:22%;"><a href="/wiki/Sistema_CGS" title="Sistema CGS">Sistema CGS</a></th><td colspan="1" class="navbox_list navbox_even"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità di base</th><td colspan="1"><a href="/wiki/Metro" title="Metro">centimetro</a><b> ·</b> <a href="/wiki/Grammo" title="Grammo">grammo</a><b> ·</b> <a href="/wiki/Secondo" title="Secondo">secondo</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità derivate</th><td colspan="1"><a href="/wiki/Dyne" title="Dyne">dyne</a><b> ·</b> <a href="/wiki/Erg" title="Erg">erg</a><b> ·</b> <a href="/wiki/Baria" title="Baria">baria</a><b> ·</b> <a href="/wiki/Poise" title="Poise">poise</a><b> ·</b> <a href="/wiki/Statcoulomb" title="Statcoulomb">statcoulomb</a><b> ·</b> <a href="/wiki/Statvolt" title="Statvolt">statvolt</a><b> ·</b> <a href="/wiki/Oersted_(unit%C3%A0_di_misura)" title="Oersted (unità di misura)">oersted</a><b> ·</b> <a href="/wiki/Gauss_(unit%C3%A0_di_misura)" title="Gauss (unità di misura)">gauss</a><b> ·</b> <a href="/wiki/Maxwell_(unit%C3%A0_di_misura)" title="Maxwell (unità di misura)">maxwell</a><b> ·</b> <a href="/wiki/Rayl" title="Rayl">rayl</a><b> ·</b> <a href="/wiki/Gal" title="Gal">gal</a></td></tr></tbody></table></td></tr><tr><th colspan="1" class="navbox_group" style="text-align:center; width:22%;"><a href="/wiki/Sistema_pratico_degli_ingegneri" title="Sistema pratico degli ingegneri">Sistema Tecnico - MFS</a></th><td colspan="1" class="navbox_list navbox_odd"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità di base</th><td colspan="1"><a href="/wiki/Metro" title="Metro">metro</a><b> ·</b> <a href="/wiki/Chilogrammo_forza" title="Chilogrammo forza">chilogrammo forza</a><b> ·</b> <a href="/wiki/Secondo" title="Secondo">secondo</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità derivate</th><td colspan="1"><a href="/wiki/Unit%C3%A0_tecnica_di_massa" title="Unità tecnica di massa">unità tecnica di massa</a></td></tr></tbody></table></td></tr><tr><th colspan="1" class="navbox_group" style="text-align:center; width:22%;"><a href="/wiki/Sistema_MTS" title="Sistema MTS">Sistema MTS</a></th><td colspan="1" class="navbox_list navbox_even"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità di base</th><td colspan="1"><a href="/wiki/Metro" title="Metro">metro</a><b> ·</b> <a href="/wiki/Tonnellata" title="Tonnellata">tonnellata</a><b> ·</b> <a href="/wiki/Secondo" title="Secondo">secondo</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità derivate</th><td colspan="1"><a href="/wiki/Sth%C3%A8ne" title="Sthène">sthène</a><b> ·</b> <a href="/wiki/Joule" title="Joule">chilojoule</a><b> ·</b> <a href="/wiki/Watt" title="Watt">chilowatt</a><b> ·</b> <a href="/wiki/Pi%C3%A8ze" title="Pièze">pièze</a></td></tr></tbody></table></td></tr><tr><th colspan="1" class="navbox_group" style="text-align:center; width:22%;"><a href="/wiki/Unit%C3%A0_atomiche" title="Unità atomiche">Unità atomiche</a></th><td colspan="1" class="navbox_list navbox_odd"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità di base</th><td colspan="1"><a href="/wiki/Raggio_di_Bohr" title="Raggio di Bohr">raggio di Bohr</a><b> ·</b> <a href="/wiki/Massa_a_riposo_dell%27elettrone" title="Massa a riposo dell'elettrone">massa a riposo dell'elettrone</a><b> ·</b> <a href="/wiki/Carica_elementare" title="Carica elementare">carica elementare</a><b> ·</b> <a href="/wiki/Costante_di_Planck#Valore" title="Costante di Planck">costante di Dirac</a><b> ·</b> <a href="/wiki/Energia_di_Hartree" title="Energia di Hartree">energia di Hartree</a></td></tr></tbody></table></td></tr><tr><th colspan="1" class="navbox_group" style="text-align:center; width:22%;"><a href="/wiki/Unit%C3%A0_di_misura_di_Planck" title="Unità di misura di Planck">Unità di misura di Planck</a></th><td colspan="1" class="navbox_list navbox_even"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità di base</th><td colspan="1"><a href="/wiki/Tempo_di_Planck" title="Tempo di Planck">tempo di Planck</a><b> ·</b> <a href="/wiki/Lunghezza_di_Planck" title="Lunghezza di Planck">lunghezza di Planck</a><b> ·</b> <a href="/wiki/Massa_di_Planck" title="Massa di Planck">massa di Planck</a><b> ·</b> <a href="/wiki/Carica_di_Planck" title="Carica di Planck">carica di Planck</a><b> ·</b> <a href="/wiki/Temperatura_di_Planck" title="Temperatura di Planck">temperatura di Planck</a><b> ·</b> <a href="/wiki/Costante_di_Planck" title="Costante di Planck">quanto del momento angolare</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;">Unità derivate</th><td colspan="1"><a href="/wiki/Energia_di_Planck" title="Energia di Planck">energia di Planck</a><b> ·</b> <a href="/wiki/Forza_di_Planck" class="mw-redirect" title="Forza di Planck">forza di Planck</a><b> ·</b> <a href="/wiki/Potenza_di_Planck" class="mw-redirect" title="Potenza di Planck">potenza di Planck</a><b> ·</b> <a href="/wiki/Densit%C3%A0_di_Planck" class="mw-redirect" title="Densità di Planck">densità di Planck</a><b> ·</b> <a href="/wiki/Frequenza_angolare_di_Planck" class="mw-redirect" title="Frequenza angolare di Planck">frequenza angolare di Planck</a><b> ·</b> <a href="/wiki/Pressione_di_Planck" class="mw-redirect" title="Pressione di Planck">pressione di Planck</a><b> ·</b> <a href="/wiki/Corrente_di_Planck" class="mw-redirect" title="Corrente di Planck">corrente di Planck</a><b> ·</b> <a href="/wiki/Tensione_di_Planck" class="mw-redirect" title="Tensione di Planck">tensione di Planck</a><b> ·</b> <a href="/wiki/Resistenza_di_Planck" class="mw-redirect" title="Resistenza di Planck">resistenza di Planck</a></td></tr></tbody></table></td></tr><tr><th colspan="1" class="navbox_group" style="text-align:center; width:22%;">Altre unità di misura</th><td colspan="1" class="navbox_list navbox_odd"><table class="subnavbox"><tbody><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Area" title="Area">Area</a></th><td colspan="1"><a href="/wiki/Ettaro" title="Ettaro">ettaro</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Densit%C3%A0_lineare" title="Densità lineare">Densità lineare</a></th><td colspan="1"><a href="/wiki/Denaro_(unit%C3%A0_di_misura)" title="Denaro (unità di misura)">denaro</a><b> ·</b> <a href="/wiki/Tex_(unit%C3%A0_di_misura)" title="Tex (unità di misura)">tex</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Entropia" title="Entropia">Entropia</a></th><td colspan="1"><a href="/wiki/Clausius_(unit%C3%A0_di_misura)" title="Clausius (unità di misura)">clausius</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Massa_(fisica)" title="Massa (fisica)">Massa</a></th><td colspan="1"><a href="/wiki/Grano_(unit%C3%A0_di_misura)" title="Grano (unità di misura)">grano</a><b> ·</b> <a href="/wiki/Scruple" title="Scruple">scruple</a><b> ·</b> <a href="/wiki/Dramma_(unit%C3%A0_di_misura)" title="Dramma (unità di misura)">dramma</a><b> ·</b> <a href="/wiki/Oncia_(unit%C3%A0_di_misura)" title="Oncia (unità di misura)">oncia</a><b> ·</b> <a href="/wiki/Libbra" title="Libbra">libbra</a><b> ·</b> <a href="/wiki/Pietra_(unit%C3%A0_di_misura)" class="mw-redirect" title="Pietra (unità di misura)">pietra</a><b> ·</b> <a href="/wiki/Quarto_(unit%C3%A0_di_misura)" title="Quarto (unità di misura)">quarto</a><b> ·</b> <a href="/wiki/Slug_(unit%C3%A0_di_misura)" title="Slug (unità di misura)">slug</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Temperatura" title="Temperatura">Temperatura</a></th><td colspan="1"><a href="/wiki/Grado_R%C3%B8mer" title="Grado Rømer">grado Rømer</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Energia" title="Energia">Energia</a></th><td colspan="1"><a href="/wiki/Caloria" title="Caloria">caloria</a><b> ·</b> <a href="/wiki/Frigoria" title="Frigoria">frigoria</a></td></tr><tr><th class="subnavbox_group" style="text-align:center; width:22%;"><a href="/wiki/Lunghezza" title="Lunghezza">lunghezza</a> in astronomia</th><td colspan="1"><a href="/wiki/Unit%C3%A0_astronomica" title="Unità astronomica">unità astronomica</a><b> ·</b> <a href="/wiki/Anno_luce" title="Anno luce">anno luce</a><b> ·</b> <a href="/wiki/Parsec" title="Parsec">parsec</a></td></tr></tbody></table></td></tr></tbody></table> <div class="noprint" style="width:100%; padding: 3px 0; display: flex; flex-wrap: wrap; row-gap: 4px; column-gap: 8px; box-sizing: border-box;"><div style="flex-grow: 1"><style data-mw-deduplicate="TemplateStyles:r140555418">.mw-parser-output .itwiki-template-occhiello{width:100%;line-height:25px;border:1px solid #CCF;background-color:#F0EEFF;box-sizing:border-box}.mw-parser-output .itwiki-template-occhiello-progetto{background-color:#FAFAFA}@media screen{html.skin-theme-clientpref-night .mw-parser-output .itwiki-template-occhiello{background-color:#202122;border-color:#54595D}html.skin-theme-clientpref-night .mw-parser-output .itwiki-template-occhiello-progetto{background-color:#282929}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .itwiki-template-occhiello{background-color:#202122;border-color:#54595D}html.skin-theme-clientpref-os .mw-parser-output .itwiki-template-occhiello-progetto{background-color:#282929}}</style><div class="itwiki-template-occhiello"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Nuvola_apps_katomic.svg" class="mw-file-description" title="Fisica"><img alt=" " src="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Nuvola_apps_katomic.svg/25px-Nuvola_apps_katomic.svg.png" decoding="async" width="25" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Nuvola_apps_katomic.svg/38px-Nuvola_apps_katomic.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/55/Nuvola_apps_katomic.svg/50px-Nuvola_apps_katomic.svg.png 2x" data-file-width="128" data-file-height="128" /></a></span> <b><a href="/wiki/Portale:Fisica" title="Portale:Fisica">Portale Fisica</a></b>: accedi alle voci di Wikipedia che trattano di fisica</div></div></div> <!-- NewPP limit report Parsed by mw‐web.eqiad.main‐7c479b968‐c6rvl Cached time: 20241117130932 Cache expiry: 2592000 Reduced expiry: false Complications: [show‐toc] CPU time usage: 0.159 seconds Real time usage: 0.260 seconds Preprocessor visited node count: 1558/1000000 Post‐expand include size: 39668/2097152 bytes Template argument size: 222/2097152 bytes Highest expansion depth: 9/100 Expensive parser function count: 1/500 Unstrip recursion depth: 0/20 Unstrip post‐expand size: 5878/5000000 bytes Lua time usage: 0.081/10.000 seconds Lua memory usage: 2104071/52428800 bytes Number of Wikibase entities loaded: 1/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 143.940 1 -total 44.89% 64.608 1 Template:Unità_di_misura 43.31% 62.339 1 Template:Navbox 18.38% 26.452 1 Template:Interprogetto 17.97% 25.869 2 Template:Cita_web 17.46% 25.136 1 Template:Portale 12.94% 18.630 7 Template:Navbox_subgroup 8.35% 12.012 1 Template:Icona_argomento 3.40% 4.894 79 Template:· --> <!-- Saved in parser cache with key itwiki:pcache:idhash:1001180-0!canonical and timestamp 20241117130932 and revision id 140344848. 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