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

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

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Mass Transfer
In steam distillation, the

Temperature is higher than the boiling point of either component
Temperature is 100°C
Product must be immiscible with water
Temperature is more than 100° C

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