p2 So they're both p2. external is p2 p2 V2 T2 and I have p2, V2, T2, on the other side.

都是2,这样末态是。

麻省理工公开课 - 热力学与动力学课程节选

Then you put two pistons, one on that side here and one on this side here, and the external pressure here, we're going to call that p1.

接下来我们放进两个活塞,一个在这，一个在这,这变外界的压强为p1；

麻省理工公开课 - 热力学与动力学课程节选