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。

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And that shows us that H is written naturally as a function of entropy and pressure.

这证明自由焓H很自然的可以写成,熵和压强的函数。

麻省理工公开课 - 热力学与动力学课程节选