{"id":44260,"date":"2019-10-15T02:50:44","date_gmt":"2019-10-15T01:50:44","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-chaleur-en-physique-chaleur-definition\/"},"modified":"2020-02-18T17:41:07","modified_gmt":"2020-02-18T16:41:07","slug":"quest-ce-que-la-chaleur-en-physique-chaleur-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-chaleur-en-physique-chaleur-definition\/","title":{"rendered":"Qu&#8217;est-ce que la chaleur en physique &#8211; Chaleur &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La chaleur est la quantit\u00e9 d&#8217;\u00e9nergie qui circule spontan\u00e9ment d&#8217;un corps \u00e0 un autre en raison de leur diff\u00e9rence de temp\u00e9rature.\u00a0La chaleur en physique &#8211; D\u00e9finition de la chaleur<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>D\u00e9finition de la chaleur<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Zeroth-Law-of-Thermodynamics-heat.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16452 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Zeroth-Law-of-Thermodynamics-heat-300x158.png\" alt=\"loi de z\u00e9roth de thermodynamique-chaleur\" width=\"300\" height=\"158\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Zeroth-Law-of-Thermodynamics-heat-300x158.png\" \/><\/a>Alors que\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lenergie-interne-energie-thermique-definition\/\"><strong>l&#8217;\u00e9nergie interne<\/strong><\/a>\u00a0fait r\u00e9f\u00e9rence \u00e0 l&#8217;\u00e9nergie totale de toutes les mol\u00e9cules de l&#8217;objet, la\u00a0<strong>chaleur<\/strong>\u00a0est la quantit\u00e9 d&#8217;\u00e9nergie\u00a0<strong>qui circule<\/strong>\u00a0spontan\u00e9ment d&#8217;un corps \u00e0 un autre en raison de leur diff\u00e9rence de temp\u00e9rature.\u00a0<strong>La chaleur<\/strong>\u00a0est une forme d&#8217;\u00e9nergie, mais c&#8217;est une\u00a0<strong>\u00e9nergie en transit<\/strong>\u00a0.\u00a0La chaleur n&#8217;est pas la propri\u00e9t\u00e9 d&#8217;un syst\u00e8me.\u00a0Cependant, le transfert d&#8217;\u00e9nergie sous forme de chaleur se produit au niveau mol\u00e9culaire \u00e0 la suite d&#8217;une\u00a0<strong>diff\u00e9rence de temp\u00e9rature<\/strong>\u00a0.<\/p>\n<p>Consid\u00e9rons un\u00a0<strong>bloc de m\u00e9tal<\/strong>\u00a0\u00e0 haute temp\u00e9rature, constitu\u00e9 d&#8217;atomes oscillant intens\u00e9ment autour de leurs positions moyennes.\u00a0<strong>\u00c0 basse temp\u00e9rature<\/strong>\u00a0, les atomes continuent \u00e0 osciller, mais avec\u00a0<strong>moins d&#8217;intensit\u00e9<\/strong>\u00a0.\u00a0Si un bloc de m\u00e9tal plus chaud est mis en contact avec un bloc plus froid, les atomes qui oscillent intens\u00e9ment au bord du bloc plus chaud d\u00e9gagent son \u00e9nergie cin\u00e9tique aux atomes les moins oscillants situ\u00e9s au bord du bloc froid.\u00a0Dans ce cas, il y a\u00a0<strong>transfert d&#8217;\u00e9nergie<\/strong>\u00a0entre ces deux blocs et la\u00a0<strong>chaleur circule<\/strong> du bloc le plus chaud au bloc le plus froid par ces vibrations al\u00e9atoires.<\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\"><span>En g\u00e9n\u00e9ral, lorsque deux objets sont mis en\u00a0<\/span><strong><span>contact thermique<\/span><\/strong><span>\u00a0, la\u00a0<\/span><strong><span>chaleur circule<\/span><\/strong><span>\u00a0entre eux\u00a0<\/span><strong><span>jusqu&#8217;\u00e0 ce<\/span><\/strong><span>\u00a0qu&#8217;ils\u00a0<\/span><strong><span>s&#8217;\u00e9quilibrent<\/span><\/strong><span>\u00a0.\u00a0Lorsqu&#8217;il\u00a0existe\u00a0une\u00a0<\/span><strong><span>diff\u00e9rence de temp\u00e9rature<\/span><\/strong><span>\u00a0, la chaleur circule spontan\u00e9ment\u00a0<\/span><strong><span>du syst\u00e8me le plus chaud vers le syst\u00e8me le plus froid<\/span><\/strong><span>\u00a0.\u00a0Le transfert de chaleur se produit par\u00a0<\/span><strong><span>conduction<\/span><\/strong><span>\u00a0ou par\u00a0<\/span><strong><span>rayonnement thermique<\/span><\/strong><span>\u00a0.\u00a0Lorsque le\u00a0<\/span><strong><span>flux de chaleur s&#8217;arr\u00eate<\/span><\/strong><span>\u00a0, on dit qu&#8217;ils sont \u00e0 la\u00a0<\/span><strong><span>m\u00eame temp\u00e9rature<\/span><\/strong><span>\u00a0.\u00a0On dit alors qu&#8217;ils sont en\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-temperature-physics\/thermal-equilibrium\/\"><strong><span>\u00e9quilibre thermique<\/span><\/strong><\/a><span>\u00a0.<\/span><span>Comme pour le travail, la quantit\u00e9 de chaleur transf\u00e9r\u00e9e\u00a0<\/span><strong><span>d\u00e9pend du chemin<\/span><\/strong><span>\u00a0et non pas simplement des conditions initiales et finales du syst\u00e8me.\u00a0Il existe en fait plusieurs fa\u00e7ons de transporter le gaz de l&#8217;\u00e9tat i \u00e0 l&#8217;\u00e9tat f.<\/span><\/p>\n<p><span>De m\u00eame, comme pour le travail, il est important de faire la distinction entre la\u00a0<\/span><strong><span>chaleur ajout\u00e9e<\/span><\/strong><span>\u00a0\u00e0 un syst\u00e8me de son environnement et la\u00a0<\/span><strong><span>chaleur retir\u00e9e<\/span><\/strong><span>\u00a0d&#8217;un syst\u00e8me \u00e0 son environnement.\u00a0Q est positif pour la chaleur ajout\u00e9e au syst\u00e8me, donc si la chaleur quitte le syst\u00e8me, Q est n\u00e9gatif.\u00a0Parce que W dans l&#8217;\u00e9quation est le travail effectu\u00e9 par le syst\u00e8me, alors si le travail est effectu\u00e9 sur le syst\u00e8me, W sera n\u00e9gatif et E\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0augmentera.<\/span><\/p>\n<p><span>Le symbole\u00a0<\/span><strong><span>q<\/span><\/strong><span>\u00a0est parfois utilis\u00e9 pour indiquer la chaleur ajout\u00e9e ou retir\u00e9e d&#8217;un syst\u00e8me\u00a0<\/span><strong><span>par unit\u00e9 de masse<\/span><\/strong><span>\u00a0.\u00a0Il est \u00e9gal \u00e0 la chaleur totale (Q) ajout\u00e9e ou retir\u00e9e divis\u00e9e par la masse (m).<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Distinguer la temp\u00e9rature, la chaleur et l&#8217;\u00e9nergie interne<\/span><\/h2>\n<p><span>En utilisant la th\u00e9orie cin\u00e9tique, une distinction claire entre ces trois propri\u00e9t\u00e9s peut \u00eatre faite.<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-temperature-physique-definition\/\"><strong><span>La temp\u00e9rature<\/span><\/strong><\/a><span>\u00a0est li\u00e9e aux<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-kinetic-energy\/\"><strong><span>\u00a0\u00e9nergies cin\u00e9tiques<\/span><\/strong><\/a><span>\u00a0des mol\u00e9cules d&#8217;un mat\u00e9riau.\u00a0C&#8217;est l&#8217;\u00e9nergie cin\u00e9tique moyenne des mol\u00e9cules individuelles.<\/span><\/li>\n<li><a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lenergie-interne-energie-thermique-definition\/\"><strong><span>L&#8217;\u00e9nergie interne<\/span><\/strong><\/a><span>\u00a0fait r\u00e9f\u00e9rence \u00e0 l&#8217;\u00e9nergie totale de toutes les mol\u00e9cules \u00e0 l&#8217;int\u00e9rieur de l&#8217;objet.\u00a0C&#8217;est une<\/span><strong><span>\u00a0propri\u00e9t\u00e9 \u00e9tendue<\/span><\/strong><span>\u00a0, donc lorsque deux lingots chauds \u00e0 masse \u00e9gale d&#8217;acier peuvent avoir la m\u00eame temp\u00e9rature, mais deux d&#8217;entre eux ont deux fois plus d&#8217;\u00e9nergie interne que l&#8217;un.<\/span><\/li>\n<li><span>Enfin, la\u00a0<\/span><a title=\"La chaleur en thermodynamique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-chaleur-en-physique-chaleur-definition\/\"><strong><span>chaleur<\/span><\/strong><\/a><span>\u00a0est la quantit\u00e9 d&#8217;\u00e9nergie qui circule d&#8217;un corps \u00e0 l&#8217;autre spontan\u00e9ment en raison de leur diff\u00e9rence de temp\u00e9rature.<\/span><\/li>\n<\/ul>\n<p><span>Il faut l&#8217;ajouter, lorsqu&#8217;il\u00a0existe\u00a0une\u00a0<\/span><strong><span>diff\u00e9rence de temp\u00e9rature<\/span><\/strong><span>\u00a0, la chaleur s&#8217;\u00e9coule spontan\u00e9ment\u00a0<\/span><strong><span>du syst\u00e8me le plus chaud vers le syst\u00e8me le plus froid<\/span><\/strong><span>\u00a0.\u00a0Ainsi, si un cube d&#8217;acier de 5 kg \u00e0 100 \u00b0 C est mis en contact avec un cube d&#8217;acier de 500 kg \u00e0 20 \u00b0 C, la chaleur circule du cube \u00e0 300 \u00b0 C vers le cube \u00e0 20 \u00b0 C m\u00eame si l&#8217;\u00e9nergie interne du cube \u00e0 20 \u00b0 C est beaucoup plus grand car il y en a tellement plus.<\/span><\/p>\n<p><span>Un concept particuli\u00e8rement important est\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-temperature-physics\/thermal-equilibrium\/\"><strong><span>l&#8217;\u00e9quilibre thermodynamique<\/span><\/strong><\/a><span>\u00a0.\u00a0En g\u00e9n\u00e9ral, lorsque deux objets sont mis en\u00a0<\/span><strong><span>contact thermique<\/span><\/strong><span>\u00a0, la\u00a0<\/span><strong><span>chaleur circule<\/span><\/strong><span>\u00a0entre eux\u00a0<\/span><strong><span>jusqu&#8217;\u00e0 ce<\/span><\/strong><span>\u00a0qu&#8217;ils\u00a0<\/span><strong><span>s&#8217;\u00e9quilibrent<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\"><\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>Exemple &#8211; \u00c9vaporation d&#8217;eau \u00e0 pression atmosph\u00e9rique<\/span><\/h2>\n<p><span>Calculer la chaleur n\u00e9cessaire pour \u00e9vaporer\u00a0\u00a0<\/span><em><span>1 kg<\/span><\/em><span>\u00a0\u00a0d&#8217;eau \u00e0 la pression atmosph\u00e9rique (p = 1,0133 bar) et \u00e0 la temp\u00e9rature de 100 \u00b0 C.<\/span><\/p>\n<p><span>Solution:<\/span><\/p>\n<p><span>Puisque ces param\u00e8tres correspondent \u00e0 l&#8217;\u00e9tat liquide satur\u00e9, seule\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/latent-heat-of-vaporization\/\"><span>la chaleur latente de vaporisation<\/span><\/a><span>\u00a0de 1 kg d&#8217;eau est requise.\u00a0\u00c0 partir\u00a0<\/span><a title=\"Tables \u00e0 vapeur - Propri\u00e9t\u00e9s sp\u00e9cifiques de l'eau et de la vapeur\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/steam-tables\/\"><span>des tables \u00e0 vapeur<\/span><\/a><span>\u00a0, la chaleur latente de vaporisation est L = 2257 kJ \/ kg.\u00a0La chaleur requise est donc \u00e9gale \u00e0:<\/span><\/p>\n<p><span>\u0394H = 2257 kJ<\/span><\/p>\n<p><span>Il faut noter que l&#8217;enthalpie sp\u00e9cifique initiale h\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0\u00a0= 419 kJ \/ kg, tandis que l&#8217;enthalpie sp\u00e9cifique finale sera h\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0\u00a0= 2676 kJ \/ kg.\u00a0L&#8217;enthalpie sp\u00e9cifique de la vapeur s\u00e8che \u00e0 basse pression est tr\u00e8s similaire \u00e0 l&#8217;enthalpie sp\u00e9cifique de la vapeur s\u00e8che \u00e0 haute pression, malgr\u00e9 le fait qu&#8217;elles ont des temp\u00e9ratures diff\u00e9rentes.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Exemple &#8211; Evaporation d&#8217;eau \u00e0 haute pression<\/span><\/h2>\n<p><span>Calculer la chaleur n\u00e9cessaire pour \u00e9vaporer\u00a0\u00a0<\/span><em><span>1 kg<\/span><\/em><span>\u00a0\u00a0d&#8217;eau d&#8217;alimentation \u00e0 la pression de 6 MPa (p = 60 bar) et \u00e0 la temp\u00e9rature de 275,6 \u00b0 C (\u00a0<\/span><a title=\"Saturation - point d'\u00e9bullition\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-saturation-point-debullition-definition\/\"><span>temp\u00e9rature de saturation<\/span><\/a><span>\u00a0).<\/span><\/p>\n<p><span>Solution:<\/span><\/p>\n<p><span>Puisque ces param\u00e8tres correspondent \u00e0 l&#8217;\u00a0\u00a0<\/span><a title=\"Liquide satur\u00e9 et sous-refroidi\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/saturated-and-subcooled-liquid\/\"><span>\u00e9tat liquide satur\u00e9<\/span><\/a><span>\u00a0, seule la chaleur latente de vaporisation de 1 kg d&#8217;eau est requise.\u00a0\u00c0 partir des tables \u00e0 vapeur, la chaleur latente de vaporisation est L = 1571 kJ \/ kg.\u00a0La chaleur requise est donc \u00e9gale \u00e0:<\/span><\/p>\n<p><span>\u0394H = 1571 kJ<\/span><\/p>\n<p><span>Il est \u00e0 noter que l&#8217;enthalpie sp\u00e9cifique initiale h\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0\u00a0= 1214 kJ \/ kg, tandis que l&#8217;enthalpie sp\u00e9cifique finale sera h\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0\u00a0= 2785 kJ \/ kg.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>La chaleur est la quantit\u00e9 d&#8217;\u00e9nergie qui circule spontan\u00e9ment d&#8217;un corps \u00e0 un autre en raison de leur diff\u00e9rence de temp\u00e9rature.\u00a0La chaleur en physique &#8211; D\u00e9finition de la chaleur D\u00e9finition de la chaleur Alors que\u00a0l&#8217;\u00e9nergie interne\u00a0fait r\u00e9f\u00e9rence \u00e0 l&#8217;\u00e9nergie totale de toutes les mol\u00e9cules de l&#8217;objet, la\u00a0chaleur\u00a0est la quantit\u00e9 d&#8217;\u00e9nergie\u00a0qui circule\u00a0spontan\u00e9ment d&#8217;un corps \u00e0 un &#8230; <a title=\"Qu&#8217;est-ce que la chaleur en physique &#8211; Chaleur &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-chaleur-en-physique-chaleur-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la chaleur en physique &#8211; Chaleur &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que la chaleur en physique - Chaleur - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"La chaleur est la quantit\u00e9 d&#039;\u00e9nergie qui circule spontan\u00e9ment d&#039;un corps \u00e0 un autre en raison de leur diff\u00e9rence de temp\u00e9rature. 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