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Two or more dissimilar metals or alloys in electrical contact with each other that act as the electrodes of an electrolytic cell if immersed in an electrolyte.

Related Terms


An electric charge at the surface of contact of two different materials. contact electromotive force See contact potential difference. contact gear ratio See contact ratio.


  1. A means of connecting two perfectly aligned shafts in which a slotted tapered sleeve is placed over the junction and two flanges are drawn over the sleeve so that they automatically center the shafts and provide sufficient contact pressure to transmit medium loads.
  2. A type of tubing fitting. Compression couplings provide a convenient method of joining relatively small diameter pipes. The olives in the coupling provide the seal by deforming into the pipe under the compressing load applied to it. There is, therefore, no need for any other jointing providing sufficient care has been taken with the original installation. Compression couplings are used in a wide variety of applications from relatively low-pressure domestic water systems (3 bar) to high-pressure hydraulic systems (200 bar).


The ratio of the length of the path of contact of two gears to the base pitch, equal to approximately the average number of pairs of teeth in contact. Also known as contact gear ratio.


The potential difference that exists across the space between two electrically connected materials. Also known as contact electromotive force; contact potential; Volta effect.


A welding process in which two layers of thermoplastic film are heated and fused to form a welded seam by clamping them together in close contact with a shielded electric heating element.


A liquid-liquid extraction vessel in which perforated plates are used to bring about contact between the two or more liquid phases.


A physical element that can be made to assume either of two stable states; a binary cell is an example.


The product distribution resulting from counter double-current extraction, a scheme in which each of the two liquid phases is transferred simultaneously and continuously in opposite directions through an interconnected train of contact vessels.


To break the contact between two objects.


The angle that is turned through by either of two wheels in gear, from the coincidence of the pitch points of a pair of teeth until the last point of contact of the teeth.

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