Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Volumetric diffusivity
Kinematic viscosity
Mass transfer co-efficient
Thermal diffusivity

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Lewis number is close to unity
Solubility of the components of air in water is very small
Water has a high latent heat of evaporation
They are always equal under all circumstances

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