Water is evaporating from a 25mm diameter test tube into a 1 atmosphere dry air. water-air interface The distance from the to the test tube outlet is L=15 cm. The mass fraction of water vapor at the water-air interface is It is 0.0235, the temperature of water is 25°C, and the diffusion coefficient of water vapor in the air is 2.6×10-5 m2/s. Water Find the mass evaporation rate of .

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Atomic diffusion in solids

In material science, diffusion can take place in solid, liquid, and gases. In solids, atomic diffusion can take place with the help of thermally activated and randomly vibrating atoms. The atomic diffusion in solids is complex and very slow in comparison to atomic diffusion in liquids and gases because the interatomic distance between the atoms is smaller in solids as compared to liquids and gases.