The state function, entropy, is introduced by the means of a perfect gas behavior, and the second law of thermodynamics is demonstrated based on the first law.
本文以理想气体的行为为手段引出熵函数，并以热力学第一定律为基础，论证了熵增大原理。
At higher temperatures the equation of state becomes better and better approximated by the "perfect gas" law.
在更高的温度区内，状态方程越来越接近于“理想气体”定律。
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