Mass Transfer
Relative humidity is the ratio of the

Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature

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Mass Transfer
Plate efficiency

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

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