Editing Enriched uranium (section)

====Thermal diffusion====
Thermal diffusion uses the transfer of heat across a thin liquid or gas to accomplish isotope separation.<ref name="Lei Science Direct"/>  The process exploits the fact that the lighter <sup>235</sup>U gas molecules will diffuse toward a hot surface, and the heavier <sup>238</sup>U gas molecules will diffuse toward a cold surface. The [[S-50 (Manhattan Project)|S-50]] plant at [[Oak Ridge, Tennessee]], was used during [[World War II]] to prepare feed material for the Electromagnetic isotope separation (EMIS) process, explained later in this article. It was abandoned in favor of gaseous diffusion.