u=q+w All right, what is delta u? delta u is q plus w.

好，Δu是多少？Δ

热力学与动力学课程节选 : 麻省理工公开课

All right, q has to be just the opposite of this because we've already figured out that there's no change in u.

好，q一定与它,相差一个符号，因为我们已经,指出U是不变的。

热力学与动力学课程节选 : 麻省理工公开课

It's well insulated. Heat is not going in or out adiabatic. q is equal to zero.

绝热性很好，热量不会变化,是绝热的，Q等于零。

热力学与动力学课程节选 : 麻省理工公开课