上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Review:Phase rule Therefore,for a system with N species and P phase: The components C=N-R (R:the number of relationships among the species) p/kPa B AR=P(C-1)+2 水 (液相) REL=C(P-1) 22090 F=VAR-REL-C-P+2 冰 (固相) 蒸发线 For one component system:C=1101.3s 汽 (气相) Single phase:P=1,F=2 0.611 升华线 0 00 Two-phase region:P=2,F=1 Triple point:P=3,F=0 273.16373.15 647.29TKTherefore, for a system with N species and P phase: The components C = N – R (R: the number of relationships among the species） VAR = P(C-1) +2 REL = C(P-1) F = VAR-REL=C-P+2 For one component system: C = 1 Single phase: P =1, F = 2 Two-phase region: P = 2, F = 1 Triple point: P = 3, F = 0 Review: Phase rule