Mass Transfer
Relative humidity is the ratio of the

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

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Partial pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to the total pressure
Vapour pressure of component A to that of component B

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