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

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

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

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