这就是说,可以很简单的写出dG在,恒定压强下对温度的偏导数,是负。
That is, it's easy to write down straight away that dG with respect to temperature at constant pressure s is minus s.
On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.
另一方面,温度,体积和压强,在实验室中比较容易保持恒定。
Whereas under these conditions, these quantities, if you look at free energy change, for example at constant temperature and pressure, H you can still calculate H.
但是,在这些条件下,这些物理量,如果我们考察自由能的变化,例如在恒定的温度和压强下,我们仍然可以计算。
It's a state function, so we're at constant temperature and pressure, and now we want to consider some chemical change or a phase transition or you name it.
这就是态函数,我们处于恒定的温度和压强之下,然后考虑某些化学变化或者相变,或者你想考虑的东西。
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