Phase rule S.J.T.U. Phase Transformation and Applications Page 18/45 Thermodynamic stability of coexisting elements,compounds,and solution Equilibrium structure How many phases 所有多相平衡系统都遵循的普遍规律！ 描述平衡系统中相数、组分数以及影响系统状态的独立 可变因素（如温度、压力、组成等）的总数（称为自由 度数)之间的关系。 SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 13 Phase RulePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 13 Phase Rule Page 18/45 Phase Rule Thermodynamic stability of coexisting elements, compounds, and solution Equilibrium structure How many phases 所有多相平衡系统都遵循的普遍规律！ 描述平衡系统中相数、组分数以及影响系统状态的独立 可变因素（如温度、压力、组成等）的总数（称为自由 度数）之间的关系