Any substance interposed between two surfaces in relative motion for the purpose of reducing the friction and/or the wear between them.


Related Terms

POINT-TO-POINT PROGRAMMING

A method of programming a robot in which each major change in the robot's path of motion is recorded and stored for later use.

PLANAR LINKAGE

A linkage that involves motion in only two dimensions.

PISTON PUMP

A pump in which motion and pressure are applied to the fluid by a reciprocating piston in a cylinder. Also known as reciprocating pump.

PISTON ENGINE

A type of engine characterized by reciprocating motion of pistons in a cylinder. Also known as displacement engine; reciprocating engine.

PICKOFF

1. A device used to convert mechanical motion into a proportional electric signal. 2. A mechanical device for automatic removal of the finished part from a press die.

PHONON FRICTION

Friction that arises when atoms close to a surface are set into motion by the sliding action of atoms in an opposing surface, and the mechanical energy needed to slide one surface over the other is thereby converted to the energy of atomic lattice vibrations (phonons) and is eventually transformed into heat.

PERS SUNSHINE RECORDER

A type of sunshine recorder in which the time scale is supplied by the motion of the sun.

PERIODIC MOTION

Any motion that repeats itself identically at regular intervals.

PENETRATION BALLISTICS

A branch of terminal ballistics concerned with the motion and behavior of a missile during and after penetrating a target.

PENDULUM SEISMOGRAPH

A seismograph that measures the relative motion between the ground and a loosely coupled inertial mass; in some instruments, optical magnification is used whereas others exploit electromagnetic transducers, photocells, galvanometers, and electronic amplifiers to achieve higher magnification.

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