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This tag is for questions relating to pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
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Definition of $PV$ work
A balloon contains gas with pressure $P_1$, volume $V_1$. It is connected to a container with vacuum with volume $V_2$, and the gas is released into the vacuum. … question is, does the $P$ in $W=\int_{V_i}^{V_f}PdV$ represent pressure of system on surroundings, or surroundings on system? …