dw=0 Well for constant volume, dw is equal to zero.

约束是恒定体积，此时。

麻省理工公开课 - 热力学与动力学课程节选

So I need, well the pressure is constant, but there's a change in volume.

压强不变，体积变化。

麻省理工公开课 - 热力学与动力学课程节选

So how would we go about solving this problem if I told you not only was there a maximum weight, but there was a maximum volume. Well, we want to go back and attack it exactly the way we attacked it the first time, which was write some mathematical formulas.

有些时候两个都重要,所以如果我告诉你这里不仅有,最大重量还有最大容量，我们应该怎么解决这个问题呢？,好了，我们想回过来然后,和第一次一样看看这个问题。

麻省理工公开课 - 计算机科学及编程导论课程节选