1.15 Equations of State (5) S.J.T.U. Phase Transformation and Applications U=U(T,V) V=V(T,P) dy du= [ar+ At constant pressure dP=0 w=器ar.)[〔器.m] SJTU Thermodynamics of Materials Fall 2012 ©X.J.Jin Lecture 2 First Law llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2012 © X. J. Jin Lecture 2 First Law II 1.15 Equations of State (5) U U(T,V) dV V U dT P T U dU V T                     V V(T,P) dP P V dT P T V dV P T                                                                  dP P V dT T V V U dT P T U dU V T P T At constant pressure dP=0                                         P T P P V P dT T V V U dT T U dU T P U        