You've just done an adiabatic compression of the ideal gas, you can pretend there is an ideal gas.

这就是对理想气体的,绝热压缩，---我们把空气近似作为理想气体处理。

麻省理工公开课 - 热力学与动力学课程节选

You're taking the air inside of the pump and you're compressing it. You're doing it so fast that there's not enough time for heat to come out of the gas that's inside the pump towards the walls of the pump.

你把空气吸进气筒里并且压缩它,你的动作很快以至于,没有足够的时间让热量,从气筒里面跑出来,传递到气筒壁上。

麻省理工公开课 - 热力学与动力学课程节选