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किसी आदर्श गैस के एक मोल का आयतन 27°C पर समतापीय तथा उत्क्रमणीय रूप से प्रसारित कर 2 L से बढ़कर 20 L हो जाता है। इस प्रक्रिया में एन्ट्रॉपी परिवर्तन की गणना करें।

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`q=DeltaE+W`
स्थिर ताप पर, `DeltaE=0`
`thereforeq=W=RTln(V_(2))/(V_(1))`
`=2.303RTlog20/2`
=`2.303xx2xx(273+27)xxlog10`
`=2.303xx2xx(273+27)xxlog10`
`=2.303xx2xx300 cal`
`=1381.8 cal`
`DeltaS=q/T=(1381.8)/(300)=4.606` cal `K^(-1)mol^(-1)`

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