版权所有：华东理工大学物理化学教研室 19 8.2 The phase rule 1). One-component systems For a one-component system Only one phase, an area: C =1, P =1 F =1-1+2=2 Two phases, The lines: C =1, P =2 F =1-2+2=1 three phases, A point: C =1, P =3 F =1-3+2=0 Four phases cannot mutually coexist in equilibrium 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 19 8.2 The phase rule 1). One-component systems For a one-component system Only one phase, an area: C =1, P =1 F =1-1+2=2 Two phases, The lines: C =1, P =2 F =1-2+2=1 three phases, A point: C =1, P =3 F =1-3+2=0 Four phases cannot mutually coexist in equilibrium The typical regions of a one-component phase diagram