This isotope separation method was the first big successful method, having been used in the Manhattan Project, notably in the K-25 reactor.
This method was superseded by the more efficient gas centrifuges.
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Gaseous diffusion is the process by which gas molecules spread out or move from an area of higher concentration to an area of lower concentration. This movement occurs due to the random thermal motion of gas molecules and continues until there is a uniform distribution of the gas in a given volume. In more technical terms, gaseous diffusion can be described by Fick's laws of diffusion.