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nature : separation of a mixture of gas method. According gas kinetic theory and the law of gas diffusion, gas mixtures in containers, the light elements of the movement speed, hitting the wall more chances; Heavy elements of the slow movement, percussive wall fewer opportunities. If the wall with numerous porous, each hole allow only through separate elements, the light elements through the wall of a certain molecular weight. The result is the proliferation of light on molecular relatively reduced, and in-situ concentration; All the heavy elements relative to the increase in concentration and devices. There can be a certain degree of separation. This method is used to separate isotopes. The difference between a small molecular weight of mixed gases, such as uranium 235 and uranium 238 in six fluoride must consecutive times, in order to achieve the required degree of separation.
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