焓dH=Tds+ap aS aS S=ST,P), ds dT+ OT aS as\dT+ aT H=H(T,p),d〃(0/xpp dh=t aT aH dt+ OT aH aS aH OT aT T dh =CdT+V-TI ds=PdT aT OT焓 dH = TdS +Vdp p p H T T H H H T p H p T ( , ), d d d            +        = = p p S T T S S S T p S p T ( , ), d d d            +        = = V p p S T T T S H T p T d d d         +            +        = T T p V p S         = −           p p p T S T T H C          =        = T T p V V T p H         = −           p T V H C T V T p d p d d                 = + − p T V T T C S p p d d  d        = −