Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Vapour laden gas at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and 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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Mass Transfer
Relative humidity is the ratio of the

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

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