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

So, these on-changing properties that describe the state of the equilibrium state of the system are called state variables.

这些描述,系统平衡态的,变化的属性,就叫做状态变量。

麻省理工公开课 - 热力学与动力学课程节选

It tells you what kind of molecule it is andgives you twovariables that are state variables You could have the volume and the temperature.

告诉你它是哪种分子,还给你了两个状态变量,它们可以是体积或温度。

麻省理工公开课 - 热力学与动力学课程节选

So the state variables describe the equilibrium's state and they don't care about how this state got to where it is.

状态变量,描述平衡态，它们并不关心,系统是如何演化成这样的。

麻省理工公开课 - 热力学与动力学课程节选

You can only use the state variables independent of history.

你只能使用不依赖于历史的,状态变量。

麻省理工公开课 - 热力学与动力学课程节选

G Here, A and G, we've already got as functions of these easily controlled, conveniently controlled state variables.

这里，A和，我们已经把它们写成了，容易控制的状态变量的函数。

麻省理工公开课 - 热力学与动力学课程节选

We're going to find other properties that do care about the history of the system like work, that you put in the system, or heat that you put in the system, or some other variables But you can't use those to define the equilibrium state.

我们还会发现其他一些,与系统的历史有关的性质,比如你对系统做的功，或者你向系统传递的热量，或其他的变量,但你不能用它们,来定义平衡态。

麻省理工公开课 - 热力学与动力学课程节选

And the useful outcome of all that is that p we get to see how entropy changes with one of those variables in terms of only V, T, and p, which come out of some equation of state.

这样做的重要结果是,我们得到了熵随着V，T或者,其中一个变量变化的情况，这些可以从状态方程得到。

麻省理工公开课 - 热力学与动力学课程节选