But if you touch the valve going into your tire which basically measures the temperature of the air going into your tire, that is getting hot, right.

以至于浑身发热,如果你摸气筒的阀门,相当于近似测量了进入轮胎的气体的温度，它会很热，对吧。

麻省理工公开课 - 热力学与动力学课程节选

So if you've got to pump that tire really a lot, then you're going to you're going to really feel a lot of heat there. The compression of the basically it's an adiabatic compression.

所以若果你给轮胎，打了很多的气，你会觉得你感觉,阀门那儿非常的烫，这种压缩,基本上是一个绝热的压缩。

麻省理工公开课 - 热力学与动力学课程节选

So the Joule free expansion involves opening this valve and asking what happens when this gas moves into the other bulb or distributes between the two.

焦耳自由膨胀就是,打开阀门后的过程,气体从一个腔跑到另一个腔,并在它们之间平均分配。

麻省理工公开课 - 热力学与动力学课程节选

There's a valve between them.

和一个连接它们的阀门。

麻省理工公开课 - 热力学与动力学课程节选