Mass Transfer
Steam distillation is used to separate

Mixtures of low relative volatility
High boiling substances from nonvolatile impurities
Heat sensitive materials
Azeotropes

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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

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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