Estimate the diffusion rate of water from the bottom of the test tube 1.5 cm in diameter and 15 cm long into dry atmosphere air at 25°C. Take diffusion coefficient of 25.6 x 10-6m2/s. A well is 30 m...

Estimate the diffusion rate of water from the bottom of the test tube 1.5 cm in diameter and 15 cm long into dry atmosphere air at 25°C. Take diffusion coefficient of 25.6 x 10-6m2/s.

A well is 30 m deep and 9 m in diameter is exposed to atmospheric pressure at 25°C. The air at the top has 50% relative humidity. Find the diffusion rate of water vapour through the well if DAB= 2.58 x 10-5m2/s.