理想气体温标它有精确的定义，并能引出绝对零度的概念。

The temperature scale that turns out to be well—defined and ends up giving us the concept of an absolute zero is the ideal gas thermometer.

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我们会发现，你们也会发现，理想气体的焦耳系数是零。

And we saw that, you saw that the Joule coefficient for an ideal gas was zero.

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但最好的事情莫过于他们不必真的制造出中子简并物质本身，只要把一些锂- 6气体冷却到接近绝对零度，然后把它们抓到激光阱并使之振动即可。

But the best thing is that they don't have to actually create neutron degenerate matter itself, just cool some lithium-6 gas to nearly absolute zero, grab it inside a laser trap and make it wobble.

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dT/dp is mu JT. So for a real gas like air, this is a positive number. It's not zero.

所以对于像空气这样的真实气体，这是一个正数，不等于零。

麻省理工公开课 - 热力学与动力学课程节选

This quantity is exactly zero for an ideal gas and we'll discover why eventually it has to do with what we mean by an ideal gas it turns out.

对理想气体它是零,这点我们接下来会知道是,为什么，这与为什么我们叫它理想气体有关。

麻省理工公开课 - 热力学与动力学课程节选

And we saw that, you saw that the Joule coefficient for an ideal gas was zero.

我们会发现，你们也会发现,理想气体的焦耳系数是零。

麻省理工公开课 - 热力学与动力学课程节选