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

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Mass Transfer
The wetted wall tower is used to determine

M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system
Individual mass transfer co-efficient (M.T.C.) in gaseous system
The overall M.T.C. of the system

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