Mass Transfer
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

Insoluble in the liquid
At a fixed temperature
Non-ideal in nature
Soluble in the liquid

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Water has a high latent heat of evaporation
They are always equal under all circumstances
Lewis number is close to unity
Solubility of the components of air in water is very small

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