Gaseous Diffusion is the method used to produce enriched uranium by forcing gaseous uranium hexafluoride (UF6) through a porous barrier at a rate of speed in direct proportion to the weight of the molecules, being used as the basis of a method of separating isotopes (as fissionable uranium 235 from the no fissionable uranium 238). Because the lighter uranium-235 is slightly more likely to pass through a membrane, a large number of membranes can separate some of the heavier uranium-238 out, producing UF6 that has a higher concentration of U-235.
Gaseous Diffusion
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