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Nitrogen from a gaseous phase is to be diffused into pure iron at 675C. If the surface concentration is maintained at 0.2wt%N, what will be

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Nitrogen from a gaseous phase is to be diffused into pure iron at 675C. If the surface concentration is maintained at 0.2wt%N, what will be the concentration 2mm from the surface after 25h ? The diffusion coefficient for nitrogen in iron at 675C is 1.91011m2/s

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