Of course in the reversible case, you're always pushing against an external pressure, which is essentially equal to the internal pressure.
当然在可逆的情况下,外压力,总是,等于内部压力。
Let's imagine maybe instead we just immediately dropped the pressure let the system expand against the lower pressure.
现在假设,我们很快地降低压力,让系统在低的外压力下膨胀。
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