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Temperature and Heat

Heat Units and Specific Heat

Description

Heat is energy transferred because of a temperature difference, and it can change an object’s temperature. Since heat is energy, its SI unit is the joule (J). Heat transfer is the movement of energy from one place or material to another, and it plays a role in home heating, cooking, and many industrial processes.

Transcript

当一杯热咖啡被放置在房间中时,其温度会逐渐降低,直至与周围空气达到热力学平衡。

由于温度梯度从咖啡传递出的能量称为热,此过程中发生的能量传递称为热流。

热量的国际单位是焦耳。另一个常用的热量单位是卡路里,其中1卡路里等于4.186焦耳。

此外,将一定质量 m 的某种物质的温度从 T1 升高到 T2 所需的热量与该物质的质量和温度变化量成正比。该比例常数 c 称为比热容。

因此,比热容是指将单位质量物质的温度升高1摄氏度所需的热量。

如果在比热容公式中使用摩尔质量(即单位物质的量的质量),则称为摩尔热容,...

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