Mass Transfer
The dimension of diffusivity is same as that of the

Velocity head
Molal concentration
Kinematic viscosity
Density

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Mass Transfer
In saturated gas, the

Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature
None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature

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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

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

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