1. A common procedure for increasing the moisture content of air is to bubble it through a column of water. Assume the air bubbles to be spheres of radius ro = 1 mm and to be in thermal equilibrium with the water at 25°C. How long should the bubbles remain in the water to achieve a vapor concentration at the center that is 99% of the maximum possible (saturated) concentration? The air is dry when it enters the water.
2. Consider Problem 1.
(a) How long should the bubbles remain in the water to achieve an average vapor concentration that is 95% of the maximum value?
(b) How long should the bubbles remain in the water to achieve an average vapor concentration that is 50% of the maximum value?