A cylindrical steel pipe is used to transport hydrogen gas in a certain process. The density of the hydrogen in the pipe is 5kg/m3 and the density in the environment is effectively zero. The pipe has a diameter of 5cm and a thickness of 3mm. If the diffusion coefficient of hydrogen in the steel is D1 = 1.24x10^-4cm2/s when the temperature is 800K, what is the leak rate of hydrogen through one meter of pipe?