Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

Humidified with wet bulb temperature decreasing
Dehumidified
Humidified at constant wet bulb temperature
None of these

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Mass Transfer
Priming in a distillation column

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

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