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The amount of heat (Btu) transmitted in 1 hour through 1 sq. ft. of a homogenous material 1 in. thick for a difference in temperature of 1o F. between two surfaces of the material.
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Related Terms |
POISON
A material which reduces the emission of electrons from the surface of a cathode.
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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.
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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.
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PLASTICIZE
To soften a material to make it plastic or moldable by adding a plasticizer or by using heat.
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PLASTICATE
To soften a material by heating or kneading. Also known as plastify.
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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.
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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.
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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.
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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.
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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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