Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Pressure falls
Temperature rises
Temperature falls
Pressure rises

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Mass Transfer
Steam distillation is not recommended to be used, if the

Azeotropic mixture is to be separated and the final product is miscible with water
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Liquids decompose, if distilled directly at atmospheric pressure

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