We looked at pressure change before, actually, in discussing the third law, the fact that the entropy goes to zero as the absolute temperature goes to zero for a pure, perfect crystal.
在讨论热力学第三定律的时候，我们讨论过压强变化，即对于纯净的完美晶体，随着温度下降到绝对零度熵也变成零。
If you change the temperature entropy changes and so on.
如果你改变温度，熵也会变化。
So that tells us what to do to know the entropy as the temperature changes.
这告诉我们当温度变化时，如何得到熵的数值。
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