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Plasma was first identified in a Crooks tube, and so described by Sir William Crookes in 1879 (he called it "radiant matter"). The nature of the Crookes tube “cathode ray” matter was subsequently identified by British physicist Sir J.J. Thomson in 1897. The term "plasma" was coined by Irving Langmuir in 1928, perhaps because the glowing discharge molds itself to the shape of the Crooks tube ( a thing moulded or formed).