Mass Transfer
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Same as
Higher than
Either same or higher than
Lower than

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Mass Transfer
Steam distillation is used to

Reduce the number of plates
Avoid thermal decomposition of a component
Increase the total pressure of distillation
Increase the efficiency of separation

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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

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

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