L1 /   
3
CH1012
1 COMPONENT SYSTEMS II
Vapour Pressure  increases with T.
TF = freezing point
TB = boiling point 
 (V.P. = external pressure)
Cairns (0m,760 torr)
= 100oC
Bartle Frere (1615m,613 torr)
= 94oC
liquid
phase boundary
 
      gas
 intermolecular
   forces alter
                                                                    b.p.
Fraction of molecules with              
sufficient Ek to escape liquid
normal m.p.   pvap(s)= pvap(l)     ptotal = 1atm