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can any one tell me when to use Cp and Cv while calculating internal energy. in adiabatic and polytropic process why do we say int. energy = nCv t and not nCp t?/?? (while we know that Cv is applied at const. vol. and Cp at const. press.) why is then E=nCvdT applicable to all cases but nCpdT not????


can any one tell me when to use Cp and Cv while calculating internal energy.
              in adiabatic and polytropic process why do we say int. energy = nCvt and not     nCpt?/??
    (while we know that Cv is applied at const. vol. and Cp at const. press.)
why is then E=nCvdT applicable to all cases but nCpdT not????


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