Two transistors of opposite conductivity (pnp and npn) in the same functional unit.
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POOLE-FRENKEL EFFECT
An increase in the electrical conductivity of insulators and semiconductors in strong electric fields.
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PHOTOPOSITIVE
Having positive photoconductivity, hence increasing in conductivity (decreasing in resistance) under the action of light; selenium ordinarily has photopositivity.
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PHOTONEGATIVE
Having negative photoconductivity, hence decreasing in conductivity (increasing in resistance) under the action of light; selenium sometimes exhibits photonegativity.
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NERNST-LINDEMANN CALORIMETER
A calorimeter for measuring specific heats at low temperatures, in which the heat reservoir consists of a metal of high thermal conductivity such as copper, to promote rapid temperature equalization; none of the material under study is more than a few millimeters from a metal surface, and the whole apparatus is placed in an evacuated vessel and heated by current through a platinum heating coil.
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KATHAROMETER
An instrument for detecting the presence of small quantities of gases in air by measuring the resulting change in thermal conductivity of the air. Also known as thermal conductivity cell.
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JUNCTION TRANSISTOR
A transistor in which emitter and collector barriers are formed between semiconductor regions of opposite conductivity type.
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HEAT OF COOLING
Increase in enthalpy during cooling of a system at constant pressure, heat conductivity See thermal conductivity.
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ANTISTATIC ADDITIVE
An additive that increases the conductivity of a hydrocarbon fuel to hasten the dissipation of electrostatic charges during high-speed dispensing, thereby reducing the fire/ explosion hazard.
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CONDUCTIVITY METER
An electric instrument used to measure the conductivity of water to determine its content of dissolved solids.
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SOLU-BRIDGE
An electronic instrument used to measure conductivity of a water sample to determine the dissolved solids content.
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