2.1 Entropy as a State Function(4) S.J.T.U. Phase Transformation and Applications ds T 2,a=0-oWa+oW=62-6w w ds T T Isothermal 2V SJTU Thermodynamics of Materials Spring2010©X.J.Jin Lecture 3 Second law IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 3 Second law I 2.1 Entropy as a State Function(4) T Q dS  rev  Qrev QWrev W Qlw T lw T Q dS  actual    Isothermal