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If I place my container of gas on the table here, and I come back an hour later, the pressure needs to be the same when I come back Otherwise it's not equilibrium.
如果我把装气体的容器放在桌子上，一小时以后我再回来时,气体的压强应该是不变的,否则它就不是平衡的。
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So what I'm doing here is I'm cooling, and then when I'm sitting at a fixed volume and I'm increasing the pressure, what am I doing? I'm heating, right?
对了，因此在这里，需要冷却,而在这里，当体积不变增加压强时？
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This is an example where the external pressure here is kept fixed as the volume changes, but it doesn't have to be kept fixed.
在我们举的这个例子中,外界压强不变，气体体积改变。
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Let's hang on for a little while longer to a set of conditions where we will maintain constant entropy, namely constant entropy and pressure.
我们先继续考虑,保持熵不变的情况，即保持熵和压强不变。
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How do I keep p1 constant while I'm lowering the volume?
怎么保持压强不变,而减小体积？
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So I need, well the pressure is constant, but there's a change in volume.
压强不变，体积变化。
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Whereas, like isobaric means constant pressure.
等压“指压强不变。
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I take V1 to V2 first, keeping the pressure constant at p1, then I take p1 to p2 keeping the volume constant V2 at V2. Let's call this path 1.
容易计算的路径，第一条路径，是首先保持压强不变,体积从V1压缩到。
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H We also saw that dS for constant H and p was greater than zero.
我们同样可以看到如果保持自由焓,和压强不变熵的变化dS也是大于零的。
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