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

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

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Mass Transfer
Relative humidity is the ratio of the

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

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