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Saadaval 51 keeles" > <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-51" 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">51 keelt</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/Warmtegeleiding" title="Warmtegeleiding – afrikaani" lang="af" hreflang="af" data-title="Warmtegeleiding" data-language-autonym="Afrikaans" data-language-local-name="afrikaani" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AA%D9%88%D8%B5%D9%8A%D9%84_%D8%AD%D8%B1%D8%A7%D8%B1%D9%8A" title="توصيل حراري – araabia" lang="ar" hreflang="ar" data-title="توصيل حراري" data-language-autonym="العربية" data-language-local-name="araabia" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/%C4%B0stilikke%C3%A7irm%C9%99" title="İstilikkeçirmə – aserbaidžaani" lang="az" hreflang="az" data-title="İstilikkeçirmə" data-language-autonym="Azərbaycanca" data-language-local-name="aserbaidžaani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Konduksi_panas" title="Konduksi panas – indoneesia" lang="id" hreflang="id" data-title="Konduksi panas" data-language-autonym="Bahasa Indonesia" data-language-local-name="indoneesia" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AA%E0%A6%B0%E0%A6%BF%E0%A6%AC%E0%A6%B9%E0%A6%A3_(%E0%A6%A4%E0%A6%BE%E0%A6%AA)" title="পরিবহণ (তাপ) – bengali" lang="bn" hreflang="bn" data-title="পরিবহণ (তাপ)" data-language-autonym="বাংলা" data-language-local-name="bengali" 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/Conducci%C3%B3_t%C3%A8rmica" title="Conducció tèrmica – katalaani" lang="ca" hreflang="ca" data-title="Conducció tèrmica" data-language-autonym="Català" data-language-local-name="katalaani" 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/Veden%C3%AD_tepla" title="Vedení tepla – tšehhi" lang="cs" hreflang="cs" data-title="Vedení tepla" data-language-autonym="Čeština" data-language-local-name="tšehhi" 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/Varmestr%C3%B8m" title="Varmestrøm – taani" lang="da" hreflang="da" data-title="Varmestrøm" data-language-autonym="Dansk" data-language-local-name="taani" 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/W%C3%A4rmeleitung" title="Wärmeleitung – saksa" lang="de" hreflang="de" data-title="Wärmeleitung" data-language-autonym="Deutsch" data-language-local-name="saksa" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Thermal_conduction" title="Thermal conduction – inglise" lang="en" hreflang="en" data-title="Thermal conduction" data-language-autonym="English" data-language-local-name="inglise" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Conducci%C3%B3n_de_calor" title="Conducción de calor – hispaania" lang="es" hreflang="es" data-title="Conducción de calor" data-language-autonym="Español" data-language-local-name="hispaania" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Varmokondukto" title="Varmokondukto – esperanto" lang="eo" hreflang="eo" data-title="Varmokondukto" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Beroaren_eroapen" title="Beroaren eroapen – baski" lang="eu" hreflang="eu" data-title="Beroaren eroapen" data-language-autonym="Euskara" data-language-local-name="baski" 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%B1%D8%B3%D8%A7%D9%86%D8%B4_%DA%AF%D8%B1%D9%85%D8%A7%DB%8C%DB%8C" title="رسانش گرمایی – pärsia" lang="fa" hreflang="fa" data-title="رسانش گرمایی" data-language-autonym="فارسی" data-language-local-name="pärsia" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Conduction_thermique" title="Conduction thermique – prantsuse" lang="fr" hreflang="fr" data-title="Conduction thermique" data-language-autonym="Français" data-language-local-name="prantsuse" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gv mw-list-item"><a href="https://gv.wikipedia.org/wiki/%C3%87hiass-chondughtaght" title="Çhiass-chondughtaght – mänksi" lang="gv" hreflang="gv" data-title="Çhiass-chondughtaght" data-language-autonym="Gaelg" data-language-local-name="mänksi" class="interlanguage-link-target"><span>Gaelg</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Conduci%C3%B3n_de_calor" title="Condución de calor – galeegi" lang="gl" hreflang="gl" data-title="Condución de calor" data-language-autonym="Galego" data-language-local-name="galeegi" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%97%B4%EC%A0%84%EB%8F%84" title="열전도 – korea" lang="ko" hreflang="ko" data-title="열전도" data-language-autonym="한국어" data-language-local-name="korea" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8B%D5%A5%D6%80%D5%B4%D5%A1%D5%B0%D5%A1%D5%B2%D5%B8%D6%80%D5%A4%D5%A1%D5%AF%D5%A1%D5%B6%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Ջերմահաղորդականություն – armeenia" lang="hy" hreflang="hy" data-title="Ջերմահաղորդականություն" data-language-autonym="Հայերեն" data-language-local-name="armeenia" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%8A%E0%A4%B7%E0%A5%8D%E0%A4%AE%E0%A4%BE_%E0%A4%9A%E0%A4%BE%E0%A4%B2%E0%A4%A8" title="ऊष्मा चालन – hindi" lang="hi" hreflang="hi" data-title="ऊष्मा चालन" 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/Kondukcija_topline" title="Kondukcija topline – horvaadi" lang="hr" hreflang="hr" data-title="Kondukcija topline" data-language-autonym="Hrvatski" data-language-local-name="horvaadi" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Varmeso-kondukto" title="Varmeso-kondukto – ido" lang="io" hreflang="io" data-title="Varmeso-kondukto" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Conduzione_termica" title="Conduzione termica – itaalia" lang="it" hreflang="it" data-title="Conduzione termica" data-language-autonym="Italiano" data-language-local-name="itaalia" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%94%D7%95%D7%9C%D7%9B%D7%AA_%D7%97%D7%95%D7%9D" title="הולכת חום – heebrea" lang="he" hreflang="he" data-title="הולכת חום" data-language-autonym="עברית" data-language-local-name="heebrea" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%96%D1%8B%D0%BB%D1%83_%D3%A9%D1%82%D0%BA%D1%96%D0%B7%D0%B3%D1%96%D1%88%D1%82%D1%96%D0%BA" title="Жылу өткізгіштік – kasahhi" lang="kk" hreflang="kk" data-title="Жылу өткізгіштік" data-language-autonym="Қазақша" data-language-local-name="kasahhi" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Kondiksyon" title="Kondiksyon – haiti" lang="ht" hreflang="ht" data-title="Kondiksyon" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haiti" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Siltumvad%C4%AB%C5%A1ana" title="Siltumvadīšana – läti" lang="lv" hreflang="lv" data-title="Siltumvadīšana" data-language-autonym="Latviešu" data-language-local-name="läti" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/%C5%A0iluminis_laidumas" title="Šiluminis laidumas – leedu" lang="lt" hreflang="lt" data-title="Šiluminis laidumas" data-language-autonym="Lietuvių" data-language-local-name="leedu" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Conduzzion_termica" title="Conduzzion termica – lombardi" lang="lmo" hreflang="lmo" data-title="Conduzzion termica" data-language-autonym="Lombard" data-language-local-name="lombardi" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%A4%E0%B4%BE%E0%B4%AA%E0%B4%9A%E0%B4%BE%E0%B4%B2%E0%B4%95%E0%B4%82" title="താപചാലകം – malajalami" lang="ml" hreflang="ml" data-title="താപചാലകം" data-language-autonym="മലയാളം" data-language-local-name="malajalami" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%95%E1%80%B0%E1%80%9C%E1%80%BB%E1%80%BE%E1%80%B1%E1%80%AC%E1%80%80%E1%80%BA%E1%80%80%E1%80%B0%E1%80%B8%E1%80%81%E1%80%BC%E1%80%84%E1%80%BA%E1%80%B8" title="အပူလျှောက်ကူးခြင်း – birma" lang="my" hreflang="my" data-title="အပူလျှောက်ကူးခြင်း" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="birma" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Wet_van_Fourier" title="Wet van Fourier – hollandi" lang="nl" hreflang="nl" data-title="Wet van Fourier" data-language-autonym="Nederlands" data-language-local-name="hollandi" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%A4%E0%A4%BE%E0%A4%AA_%E0%A4%B8%E0%A4%9E%E0%A5%8D%E0%A4%9A%E0%A4%BE%E0%A4%B2%E0%A4%A8" title="ताप सञ्चालन – nepali" lang="ne" hreflang="ne" data-title="ताप सञ्चालन" data-language-autonym="नेपाली" data-language-local-name="nepali" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E7%86%B1%E4%BC%9D%E5%B0%8E" title="熱伝導 – jaapani" lang="ja" hreflang="ja" data-title="熱伝導" data-language-autonym="日本語" data-language-local-name="jaapani" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Varmeledning" title="Varmeledning – norra bokmål" lang="nb" hreflang="nb" data-title="Varmeledning" data-language-autonym="Norsk bokmål" data-language-local-name="norra bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Varmekonduksjon" title="Varmekonduksjon – uusnorra" lang="nn" hreflang="nn" data-title="Varmekonduksjon" data-language-autonym="Norsk nynorsk" data-language-local-name="uusnorra" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Przewodzenie_ciep%C5%82a" title="Przewodzenie ciepła – poola" lang="pl" hreflang="pl" data-title="Przewodzenie ciepła" data-language-autonym="Polski" data-language-local-name="poola" 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/Condu%C3%A7%C3%A3o_t%C3%A9rmica" title="Condução térmica – portugali" lang="pt" hreflang="pt" data-title="Condução térmica" data-language-autonym="Português" data-language-local-name="portugali" 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/Legile_lui_Fourier" title="Legile lui Fourier – rumeenia" lang="ro" hreflang="ro" data-title="Legile lui Fourier" data-language-autonym="Română" data-language-local-name="rumeenia" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Heat_conduction" title="Heat conduction – lihtsustatud inglise" lang="en-simple" hreflang="en-simple" data-title="Heat conduction" data-language-autonym="Simple English" data-language-local-name="lihtsustatud inglise" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Vedenie_tepla" title="Vedenie tepla – slovaki" lang="sk" hreflang="sk" data-title="Vedenie tepla" data-language-autonym="Slovenčina" data-language-local-name="slovaki" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Zakon_o_prevajanju_toplote" title="Zakon o prevajanju toplote – sloveeni" lang="sl" hreflang="sl" data-title="Zakon o prevajanju toplote" data-language-autonym="Slovenščina" data-language-local-name="sloveeni" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Kondukcija" title="Kondukcija – serbia-horvaadi" lang="sh" hreflang="sh" data-title="Kondukcija" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbia-horvaadi" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/L%C3%A4mm%C3%B6njohtuminen" title="Lämmönjohtuminen – soome" lang="fi" hreflang="fi" data-title="Lämmönjohtuminen" data-language-autonym="Suomi" data-language-local-name="soome" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Konduktion" title="Konduktion – rootsi" lang="sv" hreflang="sv" data-title="Konduktion" data-language-autonym="Svenska" data-language-local-name="rootsi" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B5%E0%AF%86%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AE%95%E0%AF%8D_%E0%AE%95%E0%AE%9F%E0%AE%A4%E0%AF%8D%E0%AE%A4%E0%AE%B2%E0%AF%8D" title="வெப்பக் கடத்தல் – tamili" lang="ta" hreflang="ta" data-title="வெப்பக் கடத்தல்" data-language-autonym="தமிழ்" data-language-local-name="tamili" 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%81%E0%B8%B2%E0%B8%A3%E0%B8%99%E0%B8%B3%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%A3%E0%B9%89%E0%B8%AD%E0%B8%99" title="การนำความร้อน – tai" lang="th" hreflang="th" data-title="การนำความร้อน" data-language-autonym="ไทย" data-language-local-name="tai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/D%E1%BA%ABn_nhi%E1%BB%87t" title="Dẫn nhiệt – vietnami" lang="vi" hreflang="vi" data-title="Dẫn nhiệt" data-language-autonym="Tiếng Việt" data-language-local-name="vietnami" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Is%C4%B1_iletimi" title="Isı iletimi – türgi" lang="tr" hreflang="tr" data-title="Isı iletimi" data-language-autonym="Türkçe" data-language-local-name="türgi" 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%A2%D0%B5%D0%BF%D0%BB%D0%BE%D0%BF%D1%80%D0%BE%D0%B2%D1%96%D0%B4%D0%BD%D1%96%D1%81%D1%82%D1%8C" title="Теплопровідність – ukraina" lang="uk" hreflang="uk" data-title="Теплопровідність" data-language-autonym="Українська" data-language-local-name="ukraina" 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/%E7%83%AD%E4%BC%A0%E5%AF%BC" 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id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="et" dir="ltr"><p><b>Soojusjuhtivus</b> on <a href="/wiki/Energia" title="Energia">energia</a> levimine <a href="/wiki/Soojus" title="Soojus">soojusena</a> kõrgema temperatuuriga <a href="/wiki/Keha" title="Keha">kehalt</a> (või kehaosalt) madalama temperatuuriga kehale (kehaosale) aine mikroskoopiliste <a href="/wiki/Osake" title="Osake">osakeste</a> vastastikmõju tagajärjel (ei ole seotud keskkonna makroskoopilise liikumisega). </p><p>Soojusjuhtivus on <a href="/wiki/Konvektsioon" title="Konvektsioon">konvektsiooni</a> ja <a href="/wiki/Soojuskiirgus" title="Soojuskiirgus">soojuskiirguse</a> kõrval üks <a href="/wiki/Soojus%C3%BClekanne" title="Soojusülekanne">soojusülekande</a> vorme. </p><p>Soojusjuhtivus toimib eeskätt <a href="/wiki/Tahke_keha" class="mw-redirect" title="Tahke keha">tahketes kehades</a> ja vähesel määral ka <a href="/wiki/Vedelik" title="Vedelik">vedelikes</a>, kuid peaaegu puudub <a href="/wiki/Gaas" title="Gaas">gaasides</a>. </p><p>Kehade soojusjuhtivusega puutuvad inimesed kokku iga päev. Kui näiteks külm lusikas asetada kuuma vette, siis kõigepealt soojeneb vees olev osa, seejärel kandub soojus piki lusika vart edasi ja me tunneme, kuidas lusika vars muutub tasapisi soojaks. </p> <div class="mw-heading mw-heading2"><h2 id="Soojusjuhtivuse_seadus">Soojusjuhtivuse seadus</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soojusjuhtivus&veaction=edit&section=1" title="Muuda alaosa "Soojusjuhtivuse seadus"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Soojusjuhtivus&action=edit&section=1" title="Muuda alaosa "Soojusjuhtivuse seadus" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Soojusjuhtivuse seadust on matemaatilisel kujul mugav formuleerida, vaadeldes soojuse levikut homogeenses vardas pikkusega <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 \ell }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ℓ</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \ell }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f066e981e530bacc07efc6a10fa82deee985929e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.97ex; height:2.176ex;" alt="{\displaystyle \ell }"></span> ja ristlõike pindalaga <i>S</i>. Katse näitab, et kui varda otstes on fikseeritud erinevad <a href="/wiki/Temperatuur" title="Temperatuur">temperatuurid</a> <i>T</i><sub>1</sub> ja <i>T</i><sub>2</sub>, siis varda ristlõiget läbib soojusvoog intensiivsusega </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 {\frac {\Delta Q}{\Delta t}}=kS{\frac {T_{1}-T_{2}}{\ell }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">Δ</mi> <mi>Q</mi> </mrow> <mrow> <mi mathvariant="normal">Δ</mi> <mi>t</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <mi>k</mi> <mi>S</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>T</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> <mo>−</mo> <msub> <mi>T</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mrow> <mi>ℓ</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {\Delta Q}{\Delta t}}=kS{\frac {T_{1}-T_{2}}{\ell }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/35ca3bc94f4516fc6dac4413956cc1e0fa7afc4f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:18.919ex; height:5.509ex;" alt="{\displaystyle {\frac {\Delta Q}{\Delta t}}=kS{\frac {T_{1}-T_{2}}{\ell }}}"></span>,</dd></dl> <p>kus <a href="/wiki/V%C3%B5rdetegur" title="Võrdetegur">võrdetegur</a> <i>k</i> on materjali iseloomustav <a href="/wiki/Konstant" title="Konstant">konstant</a>, mida nimetatakse <a href="/wiki/Soojusjuhtivustegur" title="Soojusjuhtivustegur">soojusjuhtivusteguriks</a>. See on ainus parameeter, mida on tarvis aine või materjali soojusjuhtivuslike (või ka soojust isoleerivate) omaduste spetsifitseerimiseks. </p><p>Soojusjuhtivuse seaduse üldistamine kolme mõõtmesse annab soojusvoo tiheduse jaoks avaldise </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 {\vec {J}}=-k\nabla T}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mover> <mi>J</mi> <mo stretchy="false">→</mo> </mover> </mrow> </mrow> <mo>=</mo> <mo>−</mo> <mi>k</mi> <mi mathvariant="normal">∇</mi> <mi>T</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\vec {J}}=-k\nabla T}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b7707888efb23dc5814a237390e1bbccabf789a6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:11.478ex; height:3.009ex;" alt="{\displaystyle {\vec {J}}=-k\nabla T}"></span>,</dd></dl> <p>kus <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 \nabla T}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">∇</mi> <mi>T</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \nabla T}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f821c5afeadd28e07e1e1142c10b4656c7751d51" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:3.572ex; height:2.176ex;" alt="{\displaystyle \nabla T}"></span> on temperatuurigradient. Seda nimetatakse <a href="/w/index.php?title=Fourier%27_seadus&action=edit&redlink=1" class="new" title="Fourier' seadus (pole veel kirjutatud)">Fourier' seaduseks</a>. Kombineerides seda pidevuse võrrandiga, saadakse järgmine <a href="/wiki/Diferentsiaalv%C3%B5rrand" title="Diferentsiaalvõrrand">diferentsiaalvõrrand</a> (<a href="/wiki/Soojusjuhtivuse_v%C3%B5rrand" title="Soojusjuhtivuse võrrand">soojusjuhtivuse võrrand</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 {\frac {\partial T}{\partial t}}=K\nabla ^{2}T}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>T</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <mi>K</mi> <msup> <mi mathvariant="normal">∇</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>T</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {\partial T}{\partial t}}=K\nabla ^{2}T}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/cce91257d2f698c4a21908f1f4c82e8491b5c1d6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:13.581ex; height:5.509ex;" alt="{\displaystyle {\frac {\partial T}{\partial t}}=K\nabla ^{2}T}"></span>,</dd></dl> <p>kus <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=k/(c\rho )}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>K</mi> <mo>=</mo> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mo stretchy="false">(</mo> <mi>c</mi> <mi>ρ</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle K=k/(c\rho )}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9499749a386466ae42a4bb1f20aa13bd91f18bd4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:11.556ex; height:2.843ex;" alt="{\displaystyle K=k/(c\rho )}"></span>, kusjuures <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 \rho }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ρ</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \rho }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1f7d439671d1289b6a816e6af7a304be40608d64" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:1.202ex; height:2.176ex;" alt="{\displaystyle \rho }"></span> on aine <a href="/wiki/Tihedus" title="Tihedus">tihedus</a> ja <i>c</i> on <a href="/wiki/Erisoojus" title="Erisoojus">erisoojus</a>. See on üks matemaatilise füüsika põhivõrrandeid, mis kirjeldab muu hulgas ka <a href="/wiki/Difusioon" title="Difusioon">difusiooni</a> (sel juhul on <i>T</i> asemel difundeeruva aine kontsentratsioon ja <i>K</i> asemel on <a href="/w/index.php?title=Difusioonikonstant&action=edit&redlink=1" class="new" title="Difusioonikonstant (pole veel kirjutatud)">difusioonikonstant</a>). </p> <div class="mw-heading mw-heading2"><h2 id="Vaata_ka">Vaata ka</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soojusjuhtivus&veaction=edit&section=2" title="Muuda alaosa "Vaata ka"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Soojusjuhtivus&action=edit&section=2" title="Muuda alaosa "Vaata ka" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Soojusjuhtivustegur" title="Soojusjuhtivustegur">Soojusjuhtivustegur</a></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Pärit leheküljelt "<a dir="ltr" href="https://et.wikipedia.org/w/index.php?title=Soojusjuhtivus&oldid=6227869">https://et.wikipedia.org/w/index.php?title=Soojusjuhtivus&oldid=6227869</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Eri:Kategooriad" title="Eri:Kategooriad">Kategooriad</a>: <ul><li><a href="/wiki/Kategooria:F%C3%BC%C3%BCsika" title="Kategooria:Füüsika">Füüsika</a></li><li><a href="/wiki/Kategooria:Soojustehnika" title="Kategooria:Soojustehnika">Soojustehnika</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Selle lehekülje viimane muutmine: 23:36, 24. oktoober 2022.</li> <li id="footer-info-copyright">Tekst on kasutatav vastavalt Creative Commonsi litsentsile "<a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.et">Autorile viitamine + jagamine samadel tingimustel</a>"; sellele võivad lisanduda täiendavad tingimused. 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