这告诉我们的是，我们只有化学势，每个分子的亥姆霍兹自由能。
What this is telling us is that we just have a chemical potential, of Helmholtz free energy per molecule.
这暗示我们，最简单最自然的联系，在Q和宏观热力学两之间，是和亥姆霍兹自由能的联系。
What that suggests is that actually the simplest and most natural connection between Q and macroscopic thermodynamics is to the Helmholtz free energy.
亥姆霍兹自由能的一个比较简单的形式。
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?
应变能密度函数等于亥姆霍兹函数。
应变能密度函数等于亥姆霍兹函数。
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