Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Hot water entering and the cooled water leaving the cooling tower
None of these
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air

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Mass Transfer
Molecular diffusion is caused by the

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

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