Mass Transfer
The dimension of diffusivity is same as that of the

Molal concentration
Velocity head
Kinematic viscosity
Density

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

None of these
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
Hot water entering the tower and the wet bulb temperature of the surrounding air

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Mass Transfer
Plate efficiency

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

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