OK, we're going to do this reversibly, which means we're going to slowly change the external pressure very, very slightly at a time, so that at every point we're basically in equilibrium, p2/ until the pressure reaches a new smaller pressure p2.
整个过程保持可逆,外界压强,变化得很慢,每一个瞬间,都保持平衡,直到压强减小到末态值。
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