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And what we'll discover is that when we allow the gas to expand reversibly, we get the most work. This is neat.
最后将发现,当气体可逆膨胀的时候，对外做功最大。
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It is taking place inside this thing, and it's a constant pressure, and we'll do it reversibly, right. So that's what we've got.
它是绝热的，在这个内反应,是在恒压下，它是可逆的，对吧？
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We can do it reversibly, or we can do it irreversibly.
它可以是可逆的，也可以是不可逆的。
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And so, one constraint is the process be done reversibly.
一种约束,就是过程是可逆的。
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T2 Is the temperature T2 in this process smaller or larger than if I were to do the process reversibly with the same endpoint pressure.
这里的末态温度,与经过可逆绝热过程,到达相同压强的末态温度相比哪个比较高呢？
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So now, instead of having p external p2 equals to p2 here, I put p1 and I let this whole thing go reversibly.
也就是说,现在开始的外界压强不是，而是p1，整个过程都是可逆的。
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So the final process involves do it reversibly, or almost reversibly.
最后我们讨论，可逆过程。
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OK, we're going to do this reversibly, which means we're going to slowly change the external pressure very, very slightly at a time, so that at every point we're basically in equilibrium, p2/ until the pressure reaches a new smaller pressure p2.
整个过程保持可逆，外界压强,变化得很慢，每一个瞬间,都保持平衡，直到压强减小到末态值。
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