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汉语拼音：rè lì xué dì yī dìng lǜ

热力学的基本定律之一。可以通过做功和热传递方式改变系统的内能。其定量关系为外界传递给系统的热量等于系统内能的增量和系统对外所做的功的总和。

热力学第一定律 [rè lì xué dì yī dìng lǜ]

1. 部分根据经验，部分根据公理定义而作出的假设。热力学第一定律把能量定义为物质的一种属性；它是在热功当量的研究中逐渐形成的。

• If your body is consuming fewer calories than it's expending, something's got to go (see God, "The First Law of Thermodynamics" ).

  如果你的身体消耗更少的热量比它的花费，有什么地方去了（见上帝，他说：“热力学第一定律”）。

• Relational expressions among cooling effect, heating effect as well as cold mass fraction were obtained by the thermodynamic first law.

  本文利用热力学第一定律得到了涡流管制冷效应、制热效应及冷流比之间的关系式。

• Then making use of the first law of thermodynamics, we conclude that the Hawking temperature is invariant.

  然后利用热力学第一定律，可以得出结论，黑洞的温度并没有被修正。

• The heating effect of capacitors in operation is given based on the first law of thermodynamics.

  本文用热力学第一定律给出电容器在工作时产生的热效应。

• Concept and Extension of Energy in First and Second Law of Thermodynamics

  热力学第一定律、第二定律的能量概念及延展

• First Law of Thermodynamics, Entropy, and Second Law of Thermodynamics

  热力学第一定律、熵、热力学第二定律

• The Micro Explanation of the First Law of Thermodynamics

  热力学第一定律的微观阐释

• Applications of the First Law of Thermodynamics to Idea Gas

  热力学第一定律对理想气体的应用

• Probe into and Analyse a Variety of Expression of the First Thermodynamics Low

  热力学第一定律表达式多样性探析