3- A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200 °C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6 x 1011 m²/s, and the diffusion flux is found to be 1.2 x 107 kg/m?s. Also, it is known that the concentration of nitrogen in the steel at the high pressure surface is 4 kg/m³. How far into the sheet from this high pressure side will the concentration be 2.0 kg/m³? Assume linear concentartion profile.

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