Now for this experiment, this is a constant enthalpy experiment for the Joule-Thomson experiment, this is equal to zero.

对于这个实验，焦耳-汤姆逊实验,是一个焓不变的实验,焓变化等于0，所以我可以。

麻省理工公开课 - 热力学与动力学课程节选

I want to cool a gas with a Joule-Thomson experiment, what temperature do I have to be at?

给气体降温时,需要到达什么温度？

麻省理工公开课 - 热力学与动力学课程节选

What we've been talking about, the Joule-Thomson experiment, constant enthalpy process?

首先，刚才说的，那些有什么问题吗？,焦耳-汤姆逊实验，等焓过程？

麻省理工公开课 - 热力学与动力学课程节选

The Joule-Thomson experiment is irreversible.

实验是一个不可逆过程。

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OK, the Joule-Thomson experiment.

焦耳-汤姆逊实验。

麻省理工公开课 - 热力学与动力学课程节选

The Joule experiment was a constant energy experiment, right. Here we're going to have to find a constant enthalpy experiment, and that is going to be the Joule-Thomson experiment. That's going to extract out a physical meaning to this derivative here.

非常像焦耳实验,焦耳实验是一个能量恒定的实验,我们这里要做的是，找到一个焓不变的实验,也就是焦耳-汤姆逊实验,这个实验可以把这里的微分式形象化。

麻省理工公开课 - 热力学与动力学课程节选

So in this experiment here, delta p is less than zero. You need to have this whole thing greater than zero. So delta T is less than zero as well. So if you're below the inversion temperature and you do the Joule-Thomson experiment, you're going to end up with something that's colder on this side than that side.

所以在这个实验中，Δp小于零,这全部都大于零,因此ΔT也小于零,所以如果在低于转变,温度的情况下做焦耳-汤姆孙实验,最后的结果是,这边的温度比这边低。

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