Measurement of the ability of an automotive gasoline to resist detonation or pinging in spark-ignited engines.


Related Terms

PNEUMATIC WEIGHING SYSTEM

A system for weight measurement in which the load is detected by a nozzle and balanced by modulating the air pressure in an opposing capsule.

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.

PITOT-VENTURI FLOW ELEMENT

Liquid-flow measurement device in which a pair of concentric venturi elements replaces the pitot-tube probe.

PISTON VISCOMETER

A device for the measurement of viscosity by the timed fall of a piston through the liquid being tested.

PINT

Abbreviated pt. 1. A unit of volume, used in the United States for measurement of liquid substances, equal to 1/8 U.S. gallon, or 231/8 cubic inches, or 4.73176473 10 4 cubic meter. Also known as liquid pint (liq pt). 2. A unit of volume used in the United States for measurement of solid substances, equal to 1/64 U.S. bushel, or 107,521/3200 cubic inches, or approximately 5.50610 10 4 cubic meter. Also known as dry pint (dry pt). 3. A unit of volume, used in the United Kingdom for measurement of liquid and solid substances, although usually the former, equal to 1/8 imperial gallon, or 5.6826125 10 4 cubic meter. Also known as imperial pint.

PHOTOELECTRIC TURBIDIMETER

Device for measurement of solution turbidity by use of photocells to detect the loss of intensity of light beamed through the solution.

PHASEMETER

A ninstrument for the measurement of electrical phase angles. Also known as phase-angle meter.

PERFORMANCE EFFORT RATING

A technique in work measurement used to determine the leveling factor to be applied to an operator or a group of operators by short, randomly spaced observations of the performance index.

PENETROMETER

1. An instrument that measures the penetrating power of a beam of xrays or other penetrating radiation. 2. An instrument used to determine the consistency of a material by measurement of the depth to which a standard needle penetrates into it under standard conditions.

PAYOUT TIME

A measurement of profitability or liquidity of an investment, being the time required to recover the original investment in depreciable facilities from profit and depreciation; usually, but not always, calculated after income taxes.

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