The solubility of oxygen from the air is 2.67 × 10-4 m at sea level and 25°c what is the solubility of o2 in a mountain lake at an elevation of 12,000 ft where the atmospheric pressure is 0.657 atm? assume the temperature is 25°c, and that the percent mole of o2 in air is 20.9% at both 12,000 ft and at sea level.

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.