Mass Transfer
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

Absorption
Distillation
Liquid extraction
Evaporation

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the total pressure
Partial pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to that of component B

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