Mass Transfer
Plate efficiency

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

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Mass Transfer
Henry's law states that the

Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Vapour pressure is equal to the product of the mole fraction and total pressure
Partial pressure is equal to the product of the mole fraction and total pressure
Partial pressure of a component over a solution is proportional to the mole fraction in the vapour

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