Mass Transfer
Priming in a distillation column

Results from very low gas velocity
Is desirable from point efficiency consideration
Is characterised by the presence of foam throughout the space between trays
Reduces the overall pressure drop

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Mass Transfer
Relative humidity is the ratio of the

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

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