You need a functional form that connects the value at one state of matter, the freezing point of water to another phase change, the boiling point of water.

你需要一个函数形式来,连接物质某个态对应的温度值，如水的冰点，和另一个相变,如水的沸点。

麻省理工公开课 - 热力学与动力学课程节选

I can do that because it's reversible, and I can get a functional form out.

画出路径就意味着过程是可逆的，下面我们来看这条曲线的函数形式。

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