1. You have a tube made of a fairly permeable polymer which is carrying a gas stream under pressure. Some of the gas will diffuse through the tubing. The tubing has a wall thickness of 1 mm. If the interior concentration of gas is 11 kg/m^3 and the exterior concentration is effectively zero, determine the flux of gas through the tube. Diffusivity of the gas in the polymer is 7.35E-11 m^2/s.
What are the units of your answer?
If the tubing is 50m long and had a diameter of 50 mm, what is the mass of gas in kg which will be lost each day?
