For a sample of perfect gas when its pre...

For a sample of perfect gas when its pressure is changed isothermally from `p_(i)` to `p_(f)` , the entropy change is given by

`triangleS=nR ln ((p_(f))/(p_(i)))`

`triangleS=nR ln ((p_(i))/(p_(f)))`

`triangleS=nR Tln ((p_(f))/(p_(i)))`

`triangleS=RT ln ((p_(f))/(p_(i)))`

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