Now the volume gets smaller. p external here.

重力也一样。

麻省理工公开课 - 热力学与动力学课程节选

I mean, if the energy is lower to occupy a smaller volume, then if I have this room and a bunch of molecules of oxygen, and nitrogen and what have you in the air, and there are weak attractions between them, why don't they all just sort of glum together and find whatever volume they like.

我的意思是，如果占据小的体积会使能量降低，如果我有这样一个空间,和一些氧气，氮气和其他空气中有的气体，并且分子之间还有微弱的相互作用，为什么他们不黏在一起,然后占据他们所想要占据的体积。

麻省理工公开课 - 热力学与动力学课程节选

So that's going to results in an expansion where the new volume new temperature new pressure and an external pressure, p2 which is p2 which is a smaller pressure.

这样经过膨胀,到达了,状态为V2，T2，p2的末态，外界压强也降低到。

麻省理工公开课 - 热力学与动力学课程节选