chaleur
- Domaine
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- physiquethermodynamique et chaleur
- Date
Définitions :
Forme de l'énergie qui est échangée entre un système et son environnement ou entre deux parties d'un système, lorsqu'il existe une différence de température entre eux.
Grandeur dont l'accroissement se traduit par une augmentation de la température du corps auquel elle s'applique.
Forme d'énergie, perceptible par la température qu'elle confère à un corps.
Notes :
La quantité de chaleur est une énergie.
La chaleur est convertible en travail, aussi n'utilise-t-on plus d'unité spécifique (telle la calorie), mais le joule (J) pour mesurer l'énergie calorifique.
Terme :
- chaleur n. f.
Traductions
-
anglais
Date :Définition
Form of energy generated or transferred by combustion, chemical reaction, mechanical means or passage of electricity and measurable by its thermal effects.
A form of energy, essentially due to molecular motion, which when imparted to another body raises its temperature and for changes its state.
A form of energy ((which)) is exchanged between a system and its environment or between two parts of the system subject to a temperature difference existing between them.
A form of kinetic energy that flows from one body to another because of a temperature difference between them.
A mode of energy associated directly with and proportional to the random molecular activity (motion) of a material system.Notes :
It may be generated or transferred by combustion, chemical reaction, mechanical means, or passage of electricity. Heat is usually measured in calories or British thermal units (Btu).
It maintains or raises the temperature of the system and can be transferred to another body (gas, liquid, or solid) by radiation, convection, or conduction. It can also be converted to other forms of energy, e.g., electricity and motion. Its absence is associated with the temperature of absolute zero. Heat is also defined as energy which is transferred under a temperature gradient or difference from one body to another. Heat is variously generated, e.g., by chemical reaction, flow of electricity, friction, nuclear fission and fusion, etc.Terme :
- heat