版权所有：华东理工大学物理化学教研室 18 8.2 The phase rule The system is invariant. The s p e c i a l c o n d i t i o n c a n b e established only at the definite T and p that is characteristic of the substance and outside our control. The equilibrium of three phases is therefore represented by a point, the triple point, on the phase diagram. If three phases are in equilibrium F = 1-3+2=0 1). One-component systems The typical regions of a one-component phase diagram.版权所有：华东理工大学物理化学教研室 18 8.2 The phase rule The system is invariant. The s p e c i a l c o n d i t i o n c a n b e established only at the definite T and p that is characteristic of the substance and outside our control. The equilibrium of three phases is therefore represented by a point, the triple point, on the phase diagram. If three phases are in equilibrium F = 1-3+2=0 1). One-component systems The typical regions of a one-component phase diagram