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    Why Cp is greater than Cv for a gas?

    Asked By Donna Harper

    1 ANSWERS

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      When heat is given to a gas keeping its volume constant whole of it is used.to raise the kinetic energy hence, the temperature of the gas. But if the pressure is to be kept constant, then additional amount of heat is needed to raise the temperature of the same amount of gas by the same extent as the gas has to do work against pressure in expansion (volume is now increased). Thus according to the definition of Cp and Cv,Cp>Cv.

      When heat is given to a gas keeping its volume constant whole of it is used.to raise the kinetic energy hence, the temperature of the gas. But if the pressure is to be kept constant, then additional amount of heat is needed to raise the temperature of the same amount of gas by the same extent as the gas has to do work against pressure in expansion (volume is now increased). Thus according to the definition of Cp and Cv,Cp>Cv.



       

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