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
Actual humidity to saturation humidity
None of these

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Mass Transfer
Flash distillation is

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

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