A steel sheet is exposed to a nitrogen rich atmosphere at 900°C and achieves steady-state diffusion. The diffusion coefficient for nitrogen at this temperature is 1.85 x 10-10 m2 kg and the diffusion flux is 1.0 x 10-7 If the initial concentration of sec m2.sec kg nitrogen in the steel at the high-pressure surface is 2 at what distance into the sheet m3> will the concentration of nitrogen be 0.5 ? kg m3

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