版权所有：华东理工大学物理化学教研室 15 8.2 The phase rule The phase rule is a general relation between the variance, F, the number of components, C, and the number of phases at equilibrium, P, for a system of any composition: = − PCF + 2版权所有：华东理工大学物理化学教研室 15 8.2 The phase rule The phase rule is a general relation between the variance, F, the number of components, C, and the number of phases at equilibrium, P, for a system of any composition: = − PCF + 2