Задача id9764

Using an ocular micrometer, one monitors the change in the size of a drop of water that is kept for a sufficiently long period of time in a room at a temperature of 20°C. Initially, the radius of the drop was equal to r1 = 1.48 • 10-3 m; after a period of time τ = 25 minutes it became r2 = 1.31 • 10-3 m. Determine: a) the density of water vapor at a distance 2r1 from the center of the drop; b) diffusion coefficient of water molecules in air.

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