Mass Transfer
In saturated gas, the

Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature
None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature

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Mass Transfer
Priming in a distillation column

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

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