Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

Unidirectional diffusion from gas to liquid phase
A counter diffusion at an almost equal molar rate
Unidirectional diffusion from liquid to gas phase
Either A or B

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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

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

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