CH1012
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OTHER TRANSITIONS.h
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b) Solid           Vapour
       Sublimation
ln p = -DHsub/RT + constant
Allotropy - multiple stable phases
  in the  same physical state eg. Ice I, Ice II ...
P
CO2
1 atm pressure
1) CO2(s) sublimes at -78oC
      [ Ice melts at 0oC ]
P
H2O
P
CO2