gaseous diffusion
/ˌɡasɪəs dɪˈfjuːʒn/ /ˌɡeɪsɪəs dɪˈfjuːʒn/Physics
noun
Diffusion of gas, especially through a porous wall or membrane; a technique based on this, used for partially separating the gases in a mixture, especially in order to enrich uranium for use as a nuclear fuel. Frequently attributive Compare diffusion.
Origin
Mid 19th century. From gaseous + diffusion.