Mass Transfer
Plate efficiency

Increases due to foaming
Increases due to weeping and dumping of liquid
Is a function of the mass transfer between liquid and vapour
Increases due to liquid entrainment

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

Temperature of the liquid phase is equal to that of the vapor phase
All of these
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
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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