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And those campuses, that Interfaith Council had a set of internal interfaith discussions and also did a set of external programs like Days of Interfaith Youth Service.
那些大学，跨信仰委员会,拥有一系列内部的跨信仰讨论,还举办一系列外部的项目，例如,跨信仰青年服务日。
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We have a weight on the piston, and that weight is chosen so that p2 it acts as though p external is equal to p2.
让活塞上放一重物，让它的效果刚好,等同于外压强。
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There is a lot of research showing how difficult it is to change happiness based on external factors.
很多研究表明,基于外在因素改变快乐很难。
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And it's a superficial, formal, external similarity.
只是一种浮于表面的相似。
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This piston is being brought out, so we expect 0 the work to be negative, negative. And we start o V2 ut with zero volume. We end up with a volume p2 of V2, and the external pressure is constant to p2.
所以我们可以想象功是负的,开始的时候体积是,最终的容积是,外界的压力恒为。
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I mean maybe up the street we whisper, but here we know it. And, so here is a different kind of system where we have a constant external pressure.
或许在街上你们低声细语，但在这里不应该这样，这是另一个系统,我们有一个恒定的外压强。
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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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We're going to change the pressure above, Pext right now there's a p external, which is equal to p on the inside.
来改变外界条件，可以改变外界的压强，它将与气体压强p相等。
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Remember it's the external pressure that's important. In this case, because it's a reversible process, the external pressure turns out to be always the same as the internal pressure.
是过程非常缓慢,比如我把体积，从V1压缩到V2时，我做得十分缓慢,在过程中的任何一点。
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So that's going to results in an expansion where the new volume new temperature new pressure and an external pressure, p2 which is p2 which is a smaller pressure.
这样经过膨胀,到达了,状态为V2，T2，p2的末态，外界压强也降低到。
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