Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Pressure drop in the column is very high
Both operating and equilibrium lines are parallel
Operating line lies above the equilibrium line
Operating line lies below the equilibrium line

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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
Lewis number is close to unity
They are always equal under all circumstances
Water has a high latent heat of evaporation

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