dU=CvdT So du is still going to be equal to Cv dT, and we're still going to be able to use the first law, all these things don't matter where the path is.

于是，第一定律也依旧成立，这些关系都与路径无关。

麻省理工公开课 - 热力学与动力学课程节选

but right now you're going to have to take it for granted. So, if the Joule-Thomson coefficient is equal to zero, just like we wrote, du = Cv dT du = Cv dT for an ideal gas, we're going to dH = Cp dT have dH = Cp dT for an ideal gas as well.

但是现在请你们应该把它看成理所当然的,所以，如果焦耳-汤姆逊系数等于零,就像我们写的，对于理想气体,我们也可以得到对于理想气体。

麻省理工公开课 - 热力学与动力学课程节选

And now we're just going to substitute du in here.

现在我们把上面的du的表达式代入。

麻省理工公开课 - 热力学与动力学课程节选