Mass Transfer
In liquid extraction, if the selectivity is unity, then

Amount of solvent required will be minimum
Solvent flow rate should be very low
No separation will occur
Separation of the constituents is the most effective

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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
Solubility of the components of air in water is very small
Lewis number is close to unity
Water has a high latent heat of evaporation

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