Entropy as a State Function(3) S.J.T.U. Phase Transformation and Applications B '-)〔号- )=〔号)-〔) 这一积分的数值与积分的途径无关，代表着某个状 态的改变量，定义为熵 For a close system the reversible heat flow divided by the absolute temperature of the system is a state or point function. SJTU Thermodynamics of Materials Fall 2010 ©X.J.Jin Lecture 4 Second law llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2010 © X. J. Jin Lecture 4 Second law II Entropy as a State Function(3)  = 0       +      =         A B r B A r r T Q T Q T Q                 =       = −      B A r A B r B A r T Q T Q T Q P V A B   这一积分的数值与积分的途径无关，代表着某个状 态的改变量，定义为熵 For a close system the reversible heat flow divided by the absolute temperature of the system is a state or point function