So what they do is, they're describing how these thermodynamic properties change, in terms of only state functions and state variables.

他们的作用是描述,随着状态函数和状态变量的变化，系统的热力性质如何变化。

麻省理工公开课 - 热力学与动力学课程节选

That is, in terms of equations of state. For any material Then we would really be able to essentially calculate anything. Anything thermodynamic.

换句话说，利用任何一种物质的状态方程,我们就能够实质上,计算所有物理量，所有热力学量。

麻省理工公开课 - 热力学与动力学课程节选