So it's going to shoot up until the internal pressure and the external pressure are in equilibrium.
活塞将上,移直到内外,压强达到平衡。
It's reversible, that means that p external, equals p. I'm doing it very slowly so that I'm always in equilibrium between the external pressure and the internal pressure so I can go back and forth.
我都可以不损失能量,而把过程逆向进行,整个过程中的,每一步都保持平衡,现在我们来分别。
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