Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Mass diffusivity to momentum diffusivity
None of these
Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity

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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

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

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