A membrane is to be manufactured to the following specifications. At 700°C the leak rate of hydrogen at steady state is not to exceed 103 mol cm2 hr' when the concentrations of hydrogen are maintained...

Extracted text: A membrane is to be manufactured to the following specifications. At 700°C the leak rate of hydrogen at steady state is not to exceed 103 mol cm2 hr' when the concentrations of hydrogen are maintained at Chigh = 7.7 × 1019 atoms cm³ on one side of the membrane and Clow effectively zero on the other side. Determine the minimum thickness, {, of iron foil that will meet these requirements. The diffusion coefficient of atomic hydrogen in iron, DH, at 700°C is 3.091x104 cm? s. Express your answer in units of cm.