Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Total pressure throughout the liquid phase is equal to that throughout the vapor phase
Temperature of the liquid phase is equal to that of the vapor phase
All of these
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase

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Mass Transfer
The wetted wall tower is used to determine

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

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