That's by definition of enthalpy.
这就是由定义焓得到的。
Free Energy, Enthalpy, and Entropy.
自由能，熵，以及焓。
It's already in the lowest enthalpy state.
系统已经处于自由焓最低的状态。
There's a balance here between ordinary energy or enthalpy and entropy.
通常所说的能量，或者自由焓和熵之间存在一个平衡。
A change in enthalpy also takes place when a change of phase occurs.
相发生变化时，焓也发生变化。
But if the system is in equilibrium, none of those states has lower enthalpy.
但是如果系统处于平衡态，所有其他的态都不可能具有更低的自由焓。
In the high enthalpy region, heat transfer is intensified by rising pressure.
在高焓值区，压力越高，传热越强。
Enthalpy is the amount of energy in a system capable of doing mechanical work.
焓是系统中能够做机械工的能量的多少。
And it relates the temperature change in the Gibbs free energy with the enthalpy change.
这个方程把吉布斯自由能中的温度变化，和焓的变化联系起来。
So this irreversible process this Joule-Thomson process, is a constant enthalpy process.
所以这个不可逆过程,也就是焦耳-汤姆逊过程,是一个等焓过程。
So this irreversible process this Joule-Thomson process, is a constant enthalpy process.
所以这个不可逆过程,也就是焦耳-汤姆逊过程,是一个等焓过程。
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