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The steady state diffusion of gases through capillaries or through the pores of a solid when fusion, bulk flow of the gases is free to the total pressure in the system is constant is considered. I t is shown that the ratio of the molar occur, but in the present situation diffusion rate of the lighter gas to that of the heavier gas must be equal to the square root such bulk flow is effectively prohibited by the mechanics of flow in the fine of the ratio of the molecular weight of the heavier to the lighter. diffusion for a constant pressure sys-

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