A sheet of steel 1.5 mm thick has nitrogen atmospheres on bothsides at 1200oC and is permitted to achieve asteady-state diffusion condition. the diffusion coefficient fornitrogen in steel at this temperature is 6 x 10-11m2/s, and the diffusion flux is found to be 1.2 x10-7 kg/m2s.
Also, it is known that the concentration of nitrogen in the steelat the high-pressure surface 4 kg/m3.
How far into the sheet from this high-pressure side will theconcentration be 2.0kg/m3?