Hamer, Walter J. National Institute of Standards and Technology, Gaithersburg, Maryland.
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An electrical conductor through which an electric current enters or leaves a conducting medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum. For electrolytic solutions, many solids, and molten masses, an electrode is an electric conductor at the surface of which a change occurs from conduction by electrons to conduction by ions. For gases and vacuum, the electrodes merely serve to conduct electricity to and from the medium. See also: Electrode potential; Electrolysis; Electromotive force (cells)
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