In the opposite case, if you have a compression, then it's the opposite of expansion.
绝热压缩,的情况,与此相反。
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。
Then we're going to have another isothermal step, a compression to some point four.
然后有另外一个绝热过程,绝热压缩到4点。
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