Mass Transfer
When an unsaturated air-water mixture is heated at constant pressure, then

The relative humidity increases
The relative humidity decreases
The partial pressure of water vapour increases
The specific humidity decreases

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

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Mass Transfer
Inside the distillation column, the

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

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