Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
Actual humidity to saturation humidity

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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
Liquids decompose, if distilled directly at atmospheric pressure
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature

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