The Student Room Group

Thermo: heat capacity

Hi,

Ok so Cp=(QT)pC_p= (\frac{ \partial Q}{ \partial T})_p and TdS=dˉQreversibleTdS=\bar{d}Q_{reversible}.

Does that mean that Cp=T(ST)p C_p=T ( \frac{ \partial S}{ \partial T})_p only holds for reversible changes or is it always true ? and why ?

Thanks
mf2004

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