Condition of equilibrium (4) S.J.T.U. Phase Transformation and Applications 41,2=4,1 For single-component (G2-G )dn=AGdn=oWre If the difference in Gibbs free energy between the two states 1 and 2 is negative,then the reversible work term is negative.That means that the material may change spontaneously from state 1 to state 2 because no work needs to be done to force the change;in fact,work can be generated by the change.The potential to do so might be dissipated as lost work,but the potential to do reversible work exists. SJTU Thermodynamics of Materials Fall 2018 ©X.J.Jin Lecture 7 equilibrium IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2018 © X. J. Jin Lecture 7 equilibrium I Condition of equilibrium (4) i,2 = i,1 ( ) G2 −G1 dn = Gdn =Wrev For single-component If the difference in Gibbs free energy between the two states 1 and 2 is negative, then the reversible work term is negative. That means that the material may change spontaneously from state 1 to state 2 because no work needs to be done to force the change; in fact, work can be generated by the change. The potential to do so might be dissipated as lost work, but the potential to do reversible work exists