A pair of unlike substances, such as metals, which generate a voltage when brought in contact with an electrolyte.


Related Terms

POINT CONTACT

A contact between a specially prepared semiconductor surface and a metal point, usually maintained by mechanical periphery.

PODBIELNIAK EXTRACTOR

A solventextraction device in which centrifugal action enhances liquid-liquid contact and increases resultant separation efficiency.

PLATE TOWER

A distillation tower along the internal height of which is a series of transverse plates (bubble-cap or sieve) to force intimate contact between downward flowing liquid and upward flowing vapor.

PLASTER SHOOTING

A surface blasting method used when no rock drill is necessary or one is not available; consists of placing a charge of gelignite, primed with safety fuse and detonator, in close contact with the rock or boulder and covering it completely with stiff damp clay.

PILOTED IGNITION

The accidental initiation of combustion by means of contact of gaseous material with an external high-energy source, such as a flame, spark, electrical arc, or glowing wire.

PHONOGRAPH

[ENG ACOUS] An instrument for recording or reproducing acoustical signals, such as voice or music, by transmission of vibrations from or to a stylus that is in contact with a groove in a rotating disk.

PERFORATED-PLATE EXTRACTOR

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

PERFORATED-PLATE COLUMN

Distillation column in which vapor-liquid contact is provided by perforated plates instead of bubble-cap trays.

NATURAL-DRAFT COOLING TOWER

A cooling tower that depends upon natural convection of air flowing upward and in contact with the water to be cooled.

MUDCAP

A quantity of wet mud, wet earth, or sand used to cover a charge of dynamite or other high explosive fired in contact with the surface of a rock in mud blasting.

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