If we calculate the change in entropy during gas mixing, we will find that this quantity is positive.
如果我们计算气体混合过程中熵的变化，我们会发现这个量是正的。
And now we have to take the derivative of this quantity squared.
现在我们要对这个量的平方求导。
Remember, we take the derivative of the square. We take twice this quantity times the derivative of what we are squaring.
还记得吧，对一个量的平方求导，就得到这个量的2倍，乘以这个量的导数。
And now I'm going to assume, and this is certainly a safe assumption, that this quantity this, molar volume, isn't going to change.
现在我假定，这个物理量摩尔体积，不会发生变化，这是一个非常合理的假定。
The fear was that when this quantity of water hit the bottom, it would detach the ice from the bed on which it rested and lubricate its passage to the sea.
人们曾经担心的是当如此巨量的水撞击底部时，可能导致冰层与其底部基质的隔离，并发生向海洋的滑动。
Of this quantity 15% was added to thermoset ant 85% to thermoplastic polymers.
其中15％加于热固性聚合物，85％加于热塑性聚合物。
When this quantity exceeds 2.2 theory indicates the existence of a sharp pressure peak which has not been observed experimentally.
当这个量超过2.2时，理论表明存在陡急的压力尖峰，而这压力尖峰尚未在实验中观察到。
This quantity is called the universal gas constant.
这个量叫做普适气体恒量。
This quantity is called the universal gas constant.
这个量叫做普适气体恒量。
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