Mass Transfer
To get high tray efficiency

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

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Mass Transfer
In saturated gas, the

None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature

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