Mass Transfer
Molecular diffusion is caused by the

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

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

At the same relative humidity
And humidified
And dehumidified with decrease in wet bulb temperature
And dehumidified with increase in wet bulb temperature

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