Real refrigerators actually work with liquids that go into gases so use the latent heat of the liquid, so it doesn't really work like the Joule-Thomson expansion. So this is real.

液体变成气体来工作，以运用液体的潜热，所以这不是，真正像焦耳-汤姆逊膨胀一样工作，这是真实的气体，不像焦耳。

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PROFESSOR: Last few lectures, and we started to see some of the consequences and looked at simple changes, transformations of expansion and mixtures of liquids and gases.

教授：之前几节中，我们开始看到一些过程及结果，混合的简单的变化，关于气体，液体的扩散。

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Because of the large expansion ratio of liquid to gas with cryogenic liquids, it is very important to provide adequate ventilation where cryogenic liquids are stored and used.

因为液体到气体的大膨胀率，为正在使用液氧的地方提供充分的通风非常重要。

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