The change in entropy when the pressure ...

The change in entropy when the pressure of perfect gas is changed isothermally from `P_1` to `P_2` is

`/_\S=nRln(P_1+P_2)`

`/_\S=nRln(P_2//P_1)`

`/_\S=nRln(P_1//P_2)`

`/_\S=nRln((P_1+P_2)/(P_2))`

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