Mass Transfer
Relative humidity is the ratio of the

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

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Mass Transfer
Flash distillation is

Same as simple distillation
Most useful for handling binary systems
Same as differential distillation
Used for multicomponent systems like crude refining

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