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The power delivered by the pressure of compressed air as it expands, utilized in tools such as drills, in hoists, grinders, riveters, diggers, pile drivers, motors, locomotives, and in mine ventilating systems.



Related Terms

PNEUMATIC CAISSON

A caisson having a chamber filled with compressed air at a pressure equal to the pressure of the water outside.

POHLE AIR LIFT PUMP

A pistonless pump in which compressed air fills the annular space surrounding the uptake pipe and is free to enter the rising column at all points of its pressure but sometimes welded or bonded.

COMPRESSED AIR

Air at any pressure greater than atmospheric pressure.

AIR RECEIVER

A vessel designed for compressed-air installations that is used both to store the compressed air and to permit pressure to be equalized in the system.

AUTOMATIC LEVEL CONTROL

  1. A circuit that keeps the output of a radio transmitter or other device essentially constant, even in the presence of large changes in the input amplitude. Abbreviated ALC. 2. In an automotive vehicle, a system in which two air-chamber shock absorbers in the rear are fed compressed air by an electric compressor; pressure in the air chambers is determined automatically by sensors to maintain the vehicle at a predetermined height regardless of load.

AIR HORSEPOWER

The theoretical (minimum) power required to deliver the specified quantity of air under the specified pressure conditions in a fan, blower, compressor, or vacchamber.

AIR-INJECTION SYSTEM

A device that uses compressed air to inject the fuel into the cylinder of an internal combustion engine.

FURNACE DRAFT

The negative air pressure generated by buoyancy of hot gases inside a furnace. The temperature difference between gases within the furnace and in the atmosphere along with furnace and stack height basically determine the amount of draft generated by the furnace. Draft is generally measured in negative inches of water column. ('-w.c.'; 27.7 inches w.c. = 1 psig)

PUMPING

Unsteadiness of the mercury in a barometer, caused by fluctuations of the air pressure produced by a gusty wind or due to the motion of a vessel.

VAPOR PRESSURE-REID (RVP)

Measure of the pressure of vapor accumulated above a sample of gasoline or other volatile fuel in a standard bomb at 100°F (37.8°C). Used to predict the vapor locking tendencies of the fuel in a vehicle's fuel system. Controlled by law in some areas to limit air pollution from hydrocarbon evaporation while dispensing.

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