{"id":46378,"date":"2019-10-22T01:01:48","date_gmt":"2019-10-22T00:01:48","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-sublimation-definition\/"},"modified":"2020-03-01T09:23:41","modified_gmt":"2020-03-01T08:23:41","slug":"quest-ce-que-la-sublimation-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-sublimation-definition\/","title":{"rendered":"Qu’est-ce que la sublimation? D\u00e9finition"},"content":{"rendered":"
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En g\u00e9n\u00e9ral, la sublimation est un changement de phase d\u2019une substance directement de la phase solide \u00e0 la phase gazeuse sans passer par la phase liquide interm\u00e9diaire.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n
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Sublimation<\/h2>\n
\"sublimation\"<\/a>
Source: wikipedia.org CC BY-SA<\/figcaption><\/figure>\n

En g\u00e9n\u00e9ral, la\u00a0sublimation<\/strong>\u00a0est un\u00a0changement<\/strong><\/a>\u00a0de\u00a0phase<\/strong><\/a>\u00a0d\u2019une substance directement de la phase solide \u00e0 la phase gazeuse sans passer par la phase liquide interm\u00e9diaire.\u00a0La sublimation<\/strong>\u00a0est un\u00a0changement de phase endothermique<\/strong>\u00a0qui se produit \u00e0 des temp\u00e9ratures et \u00e0 des pressions\u00a0inf\u00e9rieures au point triple d’une substance<\/strong>\u00a0dans son diagramme de phases.<\/p>\n

Consid\u00e9rez la glace \u00e0 -10 \u00b0 C et \u00e0 une pression de 500 Pa. Dans ce cas, le transfert de chaleur \u00e0 la glace entra\u00eene d\u2019abord une augmentation de la temp\u00e9rature \u00e0 -8 \u00b0 C.\u00a0\u00c0 ce stade, cependant, la glace passe directement de la phase solide \u00e0 la phase vapeur dans le processus appel\u00e9 sublimation.\u00a0La chaleur correspondante est appel\u00e9e\u00a0chaleur de sublimation<\/strong>\u00a0, L\u00a0s<\/sub>\u00a0.\u00a0Un transfert de chaleur suppl\u00e9mentaire entra\u00eenerait une surchauffe de la vapeur.<\/p>\n

Comme la sublimation est un changement de phase endothermique, elle n\u00e9cessite de l\u2019\u00e9nergie suppl\u00e9mentaire.\u00a0Cette \u00e9nergie suppl\u00e9mentaire n\u00e9cessaire peut \u00eatre calcul\u00e9e en ajoutant l’\u00a0enthalpie de fusion<\/strong>\u00a0et l’\u00a0enthalpie de vaporisation<\/strong>\u00a0. Elle est appel\u00e9e enthalpie de sublimation (\u00e9galement appel\u00e9e chaleur de sublimation).<\/p>\n

Pour certaines substances, la sublimation est beaucoup plus facile que l’\u00e9vaporation \u00e0 l’\u00e9tat fondu.\u00a0Cela d\u00e9pend de leur triple point.\u00a0Lorsque la pression de son point triple est trop \u00e9lev\u00e9e, il est difficile de les obtenir sous forme de liquide.<\/p>\n

Le processus inverse de la sublimation est la d\u00e9sublimation, dans laquelle une substance passe directement d’un gaz \u00e0 une phase solide.<\/p>\n<\/div>\n<\/div>\n

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Cet article est bas\u00e9 sur la traduction automatique de l’article original en anglais. Pour plus d’informations, voir l’article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l’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<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

En g\u00e9n\u00e9ral, la sublimation est un changement de phase d\u2019une substance directement de la phase solide \u00e0 la phase gazeuse sans passer par la phase liquide interm\u00e9diaire.\u00a0G\u00e9nie thermique Sublimation Source: wikipedia.org CC BY-SA En g\u00e9n\u00e9ral, la\u00a0sublimation\u00a0est un\u00a0changement\u00a0de\u00a0phase\u00a0d\u2019une substance directement de la phase solide \u00e0 la phase gazeuse sans passer par la phase liquide interm\u00e9diaire.\u00a0La sublimation\u00a0est … 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":"\nQu'est-ce que la sublimation? 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