The gaseous diffusion is the gradual dispersion of a gas within another. In this way the molecules of a substance is sprayed into the region occupied by other molecules, colliding and moving randomly. This is a very quick process and does not need a body on the spread, as it diffuses through the void. The effusion is the escape of a gas into vacuum through a small hole or a porous membrane, because the gas molecules collide more frequently with the pore where the pressure is higher. Thus, there are more molecules passing from the high pressure zone to the low than vice versa. In 1860, Thomas Graham, a Scottish chemist showed that the rate of effusion and diffusion of gases is inversely proportional to the square root of its molar mass. This law follows that if the rate of effusion or diffusion is inversely proportional to the time it takes to escape a certain amount of gas, imply that the effusion time required for the shedding of a number of moles of molecules is directly proportional to the square root of the molar mass. The gaseous diffusion was one of several technologies for uranium isotope separation developed by the Manhattan Project to produce enriched uranium forcing uranium hexafluoride (the only compound of uranium gas) passes through semi-permeable membranes. This produces a very slight separation between the molecules containing uranium-235 and uranium-238. By using a cascade of many steps, you can achieve great separations. It has now become obsolete with the new gas centrifuge technology, which requires much less energy to achieve the same separation. Of the various separation technologies used lately by the Manhattan Project, the gaseous diffusion was probably the most significant. Buildings constructed to process the falls were once the largest ever built. The preparation of the subject to be treated, uranium hexafluoride (known in the market as hex) was the first application for the fluorine produced commercially, and the problems generated by the management of both the fluorine and the hex as corrosive gases were significant. It built large gaseous diffusion plants in the United States, the Soviet Union (including a plant that is now in Kazakhstan), the United Kingdom, France and China. Most of them are now closed or expected to be, unable to compete economically with the new techniques of enrichment. However, some of the technology used in pumps and membranes remains secret, and some of the materials used are still subject to export controls as part of a continuing effort to control nuclear proliferation. The text is available under the Creative Commons Attribution ShareAlike 3.0, additional terms may apply. See Terms of Use for more information.

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