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

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

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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

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

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