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10.4 A deep narrow cylindrical vessel which is open at the top contains some water at the bottom The air within the vessel is considered motionless, but there is sufficient air current at the top surface of the vessel so that any water vapour arriving at the top surface is immediately removed to ensure zero water vapour concentration. The entire system is at I atm, 298 K. The diffusivity of air-water vapour is D = 0.26 x 10-4 m/s and the saturated vapour pressure of water at the surface is 0.032 atm. Determine the rate of vaporation of water into the air per unit area if the distance between the water surface and the top of the vessel is 1.524 m.