Mass Transfer
Molecular diffusion is caused by the

Transfer of molecules from low concentration to high concentration region
Potential energy of the molecules
Activation energy of the molecules
Thermal energy of the molecules

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Mass Transfer
Flights in a rotary dryer are provided to

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

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