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That tells us the direction of spontaneous change for ordinary processes, chemical processes, mixing and you name it, under conditions that are easy to achieve in the lab.
这个物理量告诉我们在实验室,能够实现的条件下通常的过程，化学过程，混合以及你所能想到的过程，自发进行的方向。
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This Is our condition for spontaneous change.
这就是自发变化的条件。
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And the motivation for choosing a pair like that is easy to see, if we look at our condition for spontaneous change or general condition.
我们这样选择的动机,很明显，如果考察我们所考虑的自发变化的条件,或者更一般的条件。
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In general, the second law gave us the Clausius inequality for spontaneous change.
一般来说第二定律给出了,自发变化的克劳修斯不等式。
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That's our condition for spontaneous change.
这就是自发变化的条件。
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And this is for any spontaneous change.
这对于任何自发过程成立。
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The spontaneous change lowers the potential energy in that case.
在这个例子中,自发变化减小了势能。
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Sort of direction of spontaneous change.
自发过程的方向。
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And for the spontaneous change which happens irreversibly That means that'll be dq irreversible.
对于不可逆的自发过程,这说明dq是不可逆的,当过程是可逆时。
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That tells us whether the change is spontaneous.
这可以告诉我们变化是否是自发的。
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