Atmolysis
a process for separating gases or vapors of different molecular weights by transmission through a porous substance.
historical examples
by this means (“atmolysis”) he was enabled partially to separate oxygen from air.
encyclopaedia britannica, 11th edition, volume 12, slice 3 various
noun (pl) -ses (-ˌsiːz)
a method of separating gases that depends on their differential rates of diffusion through a porous substance
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