首先是构成城市的材料的热容，通常由混凝土和沥青主导。
The first is the heat capacity of the materials that constitute the city, which is typically dominated by concrete and asphalt.
我们将不会具有恒定的压力热容量，而是具有恒定的体积热容量。
We're not going to have the constant pressure heat capacity, but the constant volume heat capacity.
在农村，材料的热容量要低得多，因为植被可以防止热量轻易地从地面流入或流出。
In the countryside materials have a significantly lower heat capacity because a vegetative blanket prevents heat from easily flowing into and out of the ground.
另一方面，感热的储存允许温度有一定的灵活性。此外，水和大多数岩石等安全物质具有较大的感热容。
The storage of sensible heat, on the other hand, allows flexibility as to temperature; in addition, safe substances like water and most rocks have large sensible heat capacities.
那么我们已经看到热容的极限情况。
现在，这个热容看起来有一点复杂。
今天我们将要讨论热容的概念。
我们已经看到极限情况下的热容。
那么那就是固体的振动热容。
所以在这种情况下，高温极限的热容是零。
So in that case, the high temperature limiting heat capacity is zero.
那么为什么热容要为零？
当然对于能量，和热容的确是同样的结果。
Of course it's really the same result for the energy and the heat capacity.
热容的低温极限是什么？
所以热容的极限值是零，能量本身也是零。
So you get the zero limiting value for the heat capacity, and the energy itself is also zero.
但我想谈论一点儿热容。
好，你们发现热容是零。
那意味着热容等于零。
因为我想来看看热容。
高温时的热容是什么？
热容是怎样的,在不同极限情况下。
What the heat capacities would be in various limiting cases.
热容是du/dT，它等于零是，因为这是。
kT The heat capacity is du/dT. It's zero because, here's kT.
所以你的热容是零。
那意味着热容为零。
那么现在让我们来看看热容。
因为你在那得到摩尔数，如果你问热容有多大？
Because you've got a factor of the number of moles in there. If you ask how big is the heat capacity?
所以热容又是零。
特别地，我想谈谈热容，和我们已经看到的能量。
And in particular, I want to talk about both the heat capacity and the energy that we've seen.
为什么热容在低温时是零？
你们能了解关于这些的极多的内容,通过测量热容。
You can learn a tremendous amount about that by making measurements of the heat capacity.
如果有有限数目的可能的状态，高温时的热容是什么？
What's the heat capacity at high temperature, if there's a finite number of states available?
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