A broad subject which applies to all types of material systems (including both biological and engineering). It is concerned with planning, organizing, managing, and implementing all activities required to determine, achieve and maintain a specified contamination level.


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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