Three curves Fusion curve According to the phase rule, F=1-2+2=1 Vaporization curve Sublimation curve Four regions Solid region Vapor region liquid region According to the phase rule, Fluid region F=1-1+2=2
Fusion curve Fusion curve Vaporization curve Vaporization curve Sublimation curve Sublimation curve Three curves Three curves Four regions Four regions Solid region Solid region Vapor region Vapor region liquid region liquid region Fluid region Fluid region According to the phase rule, According to the phase rule, F=1-1+2=2 According to the phase rule, According to the phase rule, F=1-2+2=1 p T 2 C
3.1.2 PV diagram of a pure substance (1)showing only liquid,gas regions Liquid' Saturated vapor Vapor iquid/vapor -I1 Saturated liquid
liquid/vapor Liquid Vapor P 3.1.2 PV diagram of a pure substance 3.1.2 PV diagram of a pure substance Saturated vapor Saturated liquid T1 V (1)showing only liquid, gas regions (1)showing only liquid, gas regions
Critical point Saturated vapor curve liquid/vapor Vc V Saturated liquid curve T>Tc>T>T>T3
PC liquid/vapor Liquid Vapor P VC Critical point Saturated vapor curve Saturated liquid curve TC T T1 T2 T3 V T >TC >T1 >T2 >T3
(2)showing solid,liquid,gas regions Solid/liquid Saturated vapor curve Critical point Solid solid curve liquid/vapor Vapor id/vapor The triple phase curve Sublimation curve Saturated liquid curve
(2)showing solid, liquid, gas regions (2)showing solid, liquid, gas regions P C V C P V liquid/vapor Liquid Vapor Critical point Solid/liquid solid solid/vapor Saturated vapor curve Saturated vapor curve Saturated liquid curve Saturated liquid curve Solid curve Sublimation Sublimation curve The triple phase curve
=0 One point: the critical point =0 Five curves: saturated liquid curve saturated vapor curve solid curve sublimation curve Triple phase curve Seven regions: solid region liquid region vapor region solid/liquid region liquid/vapor region solid/vapor region sup-critical fluid region
One point: One point: solid region liquid region vapor region solid region liquid region vapor region solid/liquid region liquid/vapor region solid/liquid region liquid/vapor region solid/vapor region sup solid/vapor region sup-critical fluid region critical fluid region Seven regions: Seven regions: Five curves: Five curves: saturated liquid curve saturated liquid curve saturated vapor curve saturated vapor curve solid curve solid curve sublimation curve sublimation curve Triple phase curve Triple phase curve the critical point the critical point 0 0 2 2 = ⎟⎟⎠⎞ ⎜⎜⎝⎛ = ⎟⎟⎠⎞ ⎜⎜⎝⎛ c,T c,T V P V P ∂ ∂ ∂ ∂