Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is independent of pressure
Is equal to the volumetric diffusivity
Varies directly as the pressure
Varies inversely as the pressure

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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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