The efficiency with which a material radiates thermal energy, expressed as a fraction between 0 and 1.


Related Terms

POISON

A material which reduces the emission of electrons from the surface of a cathode.

PLUGGING

1. Braking an electric motor by reversing its connections, so it tends to turn in the opposite direction; the circuit is opened automatically when the motor stops, so the motor does not actually reverse. 2. The formation of a barrier (plug) of solid material in a process flow system, such as a pipe or reactor.

PLASTICORDER

Laboratory device used to predict the performance of a plastic material by measurement of temperature, viscosity, and shear-rate relationships. Also known as plastigraph.

PLASTICIZE

To soften a material to make it plastic or moldable by adding a plasticizer or by using heat.

PLASTICATE

To soften a material by heating or kneading. Also known as plastify.

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.

PIEZOELECTRIC GAGE

A pressure-measuring gage that uses a piezoelectric material to develop a voltage when subjected to pressure; used for measuring blast pressures resulting from explosions and pressures developed in guns.

PIERCING GRIPPER

A robot component that first punctures a material such as cloth, rubber, or porous sheets, or soft plastic in order to lift and handle it. pier foundation See caisson foundation.

PHOTOELECTRICLOOPCONTROL

[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.

PHASE-CHANGE MATERIAL

A material which is used to store the latent heat absorbed in the material during a phase transition.

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