绝热可逆路径。
And what you'll find is that the maximum work out is obtain for a reversible path.
对于各种可能的中间路径，我们将发现，做功做多的是可逆路径。
Now remember, we went through before how it's a state function but to calculate it, you'd need to find a reversible path, along which you can figure this out.
请记住，我们不需要知道它是怎样的一个态函数，只计算就可以了，你需要找到一条可逆路径，沿着这条路径就能算得这个结果。
So we've got our reversible adiabatic path right.
那么我们有了这条可逆绝热路径。
Now, this is a reversible adiabatic path, so there's a relationship that I'm sure you'll remember.
现在是可逆绝热过程，因此这里有一个关系式，我相信你们还记得。
If it was non-reversible, I would be allowed to put an initial point and a final point, but I wouldn't be allowed to put a path between them like this, connecting them together.
如果是不可逆过程，我可以画出过程的初态点，和末态点，但是我不能再像这样，画出连接这两个点的，路径曲线来。
If it was non-reversible, I would be allowed to put an initial point and a final point, but I wouldn't be allowed to put a path between them like this, connecting them together.
如果是不可逆过程，我可以画出过程的初态点，和末态点，但是我不能再像这样，画出连接这两个点的，路径曲线来。
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