Mass Transfer
To get high tray efficiency

Gas velocity should be very low
Interfacial surface between liquid and gas phase should be large
Liquid entrainment should be severe
Time of contact between the two phases should be less

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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
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
Vapour pressure is equal to the product of the mole fraction and total pressure

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