称为正则配分函数。
上节课我们看到了如何,从正则配分函数导出，内能等量。
So last time, then, you saw how from the canonical partition function, you could get something like the energy.
然后，大，整个系统的正则配分函数，这是我们之前探讨过的。
Q And then, big Q, the canonical partition function for the whole system, it's something that we've been through before.
这就让我们开始思考，要怎么来表示亥姆霍兹自由能,用正则配分函数？
So it becomes interesting, then, to figure out, how can we write the Helmholtz free energy in terms of the canonical partition function?
那么现在我们就能写出,分子构型的配分函数,和系统的正则配分函数。
So now we can just write out the configurational partition function for the molecules and also the canonical partition function for the system.
化学势，从基本方程上说，就是A对N的偏导，因此对A取N偏导，因此化学势也能，用正则配分函数表示。
The chemical potential from the fundamental equation up here is the derivative of a with respect to the number of particles.
化学势，从基本方程上说，就是A对N的偏导，因此对A取N偏导，因此化学势也能，用正则配分函数表示。
The chemical potential from the fundamental equation up here is the derivative of a with respect to the number of particles.
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