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

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

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Mass Transfer
Molecular diffusion is caused by the

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

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