Electrical Conductor.There are different types of electrical conductor the first, the most familiar, being electronic conductors such as metals. There are two other types of electrical conductor that are very pertinent to electrochemistry, and these are characterized by the fact that the transfer of current is accompanied by the transfer of matter. One type concerns pure substances such as fused salts and the other involves solutions, usually solutions of acids, bases or salts in water. There are a few substances that have both characteristics e.g. β-silver sulphide in which 80% of the current is conducted electrolytically the remainder electronically. Solutions of alkali metals in liquid ammonia and certain molten alloys are also examples of substances that conduct by both mechanisms simultaneously.

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