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

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

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high
Extracting solvent is cheaply & abundantly available

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