p Well, it's not just p dS/dV because there's some dS/dV at constant T.
它不是简单的,因为式子中还包含,恒定温度下的。
TdS It comes from the fact that dq reversible is T dS, pdV and dw reversible is minus p dV.
这个结论来自于:可逆过程下dq等于,做功dw等负的。
du external dV minus T surroundings dS is less than zero.
加上压强p,du,plus,p,乘以dV减去环境温度T乘以dS小于零。
H We also saw that dS for constant H and p was greater than zero.
我们同样可以看到如果保持自由焓,和压强不变熵的变化dS也是大于零的。
pdV So, du is T dS minus p dV.
即du等于TdS减去。
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