There's p1 here, and p2 here So I'm starting at p1, V1. I'm starting right here And I'm going to end right here.

它的分子间作用力很小,十分接近理想气体,对它做一个压缩过程。

麻省理工公开课 - 热力学与动力学课程节选

Then we're going to have another isothermal step, a compression to some point four.

然后有另外一个绝热过程，绝热压缩到4点。

麻省理工公开课 - 热力学与动力学课程节选

But you don't compress it so quickly that you're not in there reversible process so you compress that if you were to feel the temperature of the air and you can feel it through the nozzle gives you an idea of the temperature of the air inside your bicycle pump.

但是压缩速度,也不能太快,否则就不是,可逆过程了,这样当压缩气体时,从喷嘴可以感受到,内部气体的温度。

麻省理工公开课 - 热力学与动力学课程节选

Remember it's the external pressure that's important. In this case, because it's a reversible process, the external pressure turns out to be always the same as the internal pressure.

是过程非常缓慢,比如我把体积，从V1压缩到V2时，我做得十分缓慢,在过程中的任何一点。

麻省理工公开课 - 热力学与动力学课程节选