Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Temperature of the liquid phase is equal to that of the vapor phase
All of these
Total pressure throughout the liquid phase is equal to that throughout the vapor phase

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Mass Transfer
Flights in a rotary dryer are provided to

Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
None of these
Increase the residence time of the solid
Reduce the residence time of solid

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