Mass Transfer
Critical humidity of a solid salt means the humidity

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

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with increase in wet bulb temperature
And dehumidified with decrease in wet bulb temperature
At the same relative humidity
And humidified

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