恒温下熵变的计算(4) S.J.T.U. Phase Transformation and Applications EX:copper, a,=16.7×106K-1 V=13 InV=3Inl =3 l V 0,=3a1 For a change in pressure from 1 atm to 10 atm at constant pressure. AS--fVapdP=-Var(P:-P)=-9RVa,=-27RVar =-3.24×10-4J/mol.K) △S=-19.14J/molK) for an ideal gas 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(4) For a change in pressure from 1 atm to 10 atm at constant pressure. J mol K S V dP V V P P PV V PV l P P V                 3.24 10 / ( ) 9 27 4 2 1 1 1 2 1     EX: copper, 6 1 16.7 10  l   K l dl V dV V l lnV 3ln l 3 3    V l P T l dT l dV V    3 1 3                 S  19.14 J /molK for an ideal gas