Mass Transfer
Inside the distillation column, the

None of these
Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column
Driving force for the vapour flow is the pressure drop

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

Vapour laden gas at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and room temperature
Vapour laden gas at 1 atm. and gas temperature

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