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So when I expand this gas adiabatically and it cools down, why do you think it might cool down?
现在我们知道了气体绝热膨胀时,温度会下载，为什么会降温？
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It's one of the only compounds, there's only I think three, where the density actually goes down when it freezes.
它是我见过的，唯一一个，在降温时密度下降的化合物。
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If I had taken as my interpolation scheme, my white curve here, I could go to infinity and have the equivalent of absolute zero being at infinity, minus infinity.
要注意，如果我们采用，像图中白线这样的插值方案的话,我就可以一直降温下去,相应的绝对零度点。
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Suppose we put somebody in a state of suspended animation, cool their body down so that the various metabolic processes come to an end.
假设我们让某人,进入假死状态，将他们的身体降温,所有的代谢过程都停止。
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Packs of ice were put on my forehead to keep down the fever.
冰袋放在额头上用来降温。
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Think of anything else with the density goes down when it freezes, and think about where we would be if that wasn't the case.
想想有没有其他的物质,在降温时密度会变大，再想想如果不是这种情况,我们将会怎么样。
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So the work that you're doing to expand, to go through this experiment, ends up cooling the gas.
因此在膨胀气体的过程中,气体降温。
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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？
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We call that inversion because on one side you end up cooling if you compress.
因为在这个温度的一边,当你压缩气体时气体降温。
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The reversible process is going to be colder because it has to expend more energy.
可逆过程降温更多,因为输出的能量更多。
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The temperature is not going to cool as much for the irreversible process.
对不可逆过程,降温不会有可逆过程多。
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They're supposed, there's a cooling happening in both cases.
两种情况下，气体都会降温。
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You take your room temperature liquid helium and you cool it with liquid nitrogen to 77 degrees Kelvin, the new, you're not quite there yet 77k unfortunately right? Then you take hydrogen you cool it would liquid nitrogen to 77, then you can use your hydrogen gas.
首先要有常温的氦气,拿液氮把它冷却到77k，那个新来的7,你不坐在那儿，对吧？,然后用液氮把氢气降温到,然后就可以使用这个氢气了，想要用氢气来做焦耳-汤姆孙实验。
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