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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。
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so we're going to use this concept of the path to go from the initial point to the end point.
在处理状态函数时,路径的选取。
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Why? It is because it is state function.
为什么，因为能量是一个状态函数。
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And for the sake of this class, we're going to consider most gases to be ideal gases. Questions?
有问题吗？好，现在，这一方程建立了,三个状态函数之间的联系：
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There's a volume, there's a temperature, than the pressure here. There's other volume, temperature and pressure here, corresponding to this system here.
温度等状态函数有本质区别，这个状态有一组，确定的体积，温度与压强。
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OK, so, the thing about a state function is that the function has a value for initial conditions and at final conditions.
态函数的特点是,在初始状态有一个值,在末状态也有一个值。
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I don't need to know about a specific path here.
这只涉及系统的状态函数。
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And that is what this is saying.
这就是状态函数的意义。
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In this case, V = /P. Have two quantities and the number of moles gives you another property. You don't need to know the volume. All you need to know is the pressure and temperature and the number of moles to get the volume.
以及气体的摩尔数,就可以得到第三个量,知道压强，温度和气体的,摩尔数就可以推导出气体的体积,这称为状态方程,它建立了状态函数之间的联系。
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So now, this equation here relates three state functions together: the pressure the volume, and the temperature. Now, if you remember, we said that if you had a substance, if you knew the number of moles and two properties, you knew everything about the gas.
压强，体积和温度,大家应该还记得,我们提过，只要知道气体的摩尔数,和任意两个状态函数,就可以推导出其他的状态函数，这样，我们可以把它改写成。
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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。
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