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You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 152.0 ppm and is initially uniform through the thickness of the
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.23 kg m-3. Under these conditions the total surface area of the balloon is 0.46 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1.
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