Mass Transfer
Critical humidity of a solid salt means the humidity

Above Which it will always become dry and below which it will always stay damp
Above which it will always become damp
Both A and B
Below which it will always stay dry

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

None of these
Hot water entering and the cooled water leaving the cooling tower
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air

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