恒温下熵变的计算（③） S.J.T.U. Phase Transformation and Applications as s-s=∫s) dp EX:solid the volumetric thermal expansion coefficient, =Vav For a change in pressure from 1 atm to 10 atm at constant pressure.The molar volume and volumetric thermal expansion coefficient are constant over the pressure range of interest. AS=-fVaydP--Var(P-P)=-9Vap SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 6 Property Relation llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 6 Property Relation II 恒温下熵变的计算(3) T T P V P S                                 2 1 2 1 2 1 P P P dP T V S S d S EX: solid the volumetric thermal expansion coefficient, For a change in pressure from 1 atm to 10 atm at constant pressure. The molar volume and volumetric thermal expansion coefficient are constant over the pressure range of interest. V V P P S VV dP V (P2 P1 ) 9V 2 1          V V P P V V T V T V V                     1