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Under which condition will the pressure-...

Under which condition will the pressure-volume work be, `w=- underset(V_(1))overset(V_(2))intPdV?` [P=pressure of the gas].

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`w=-underset(V_(1))overset(V_(2))intP_(ex)dV`
In a reversible process, `P_(ex)=P` (pressure of the gas),
so, in case of a reversible process, `w=-underset(V_(1))overset(V_(2)) intPdV`.
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