A thin 1 mm thick ?-iron membrane at 250°C is subjected to an atmosphere of hydrogen gas on one side, and the concentration of hydrogen in the iron, in weight percent, is 7.02 x 10-5 wt%. The concentration of hydrogen on the other side of the membrane is 9.93 x 10-6 wt%. Calculate the concentrations of hydrogen in the iron on both sides of the membrane in kgm-3.