Condition of equilibrium S.J.T.U. Phase Transformation and Applications Two states are in equilibrium when no reversible work can be done by having the system change between those two states 2 6W,ev1->2=0 MA m Figure 4.1 Machine MA to trans- form mass m from state I to state 2. The temperatures in the two states must be equal .A consequence of the second law of thermodynamics .Otherwise... 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 • Two states are in equilibrium when no reversible work can be done by having the system change between those two states Wrev.1→2 = 0 • The temperatures in the two states must be equal •A consequence of the second law of thermodynamics •Otherwise…