For isothermal expansion, that means that delta u does not change, but delta q is equal to delta w?

在等温过程中，是不是内能不变，Δq等于Δw？

麻省理工公开课 - 热力学与动力学课程节选

dq It's an ideal gas in adiabatic expansion 0 dq is equal to zero.

说明,等于。

麻省理工公开课 - 热力学与动力学课程节选

p We want p equal to p external for the entire expansion, p2 and p external is decreased steadily from p1 to p2.

在膨胀过程中保持p等于外部，外部p很快从p1衰减到。

麻省理工公开课 - 热力学与动力学课程节选

Going from two to three, that's an adiabatic expansion, so q is equal to zero in that step.

从第二点到第三点，是绝热膨胀，因此q等于零。

麻省理工公开课 - 热力学与动力学课程节选