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The concentration of a hydrocarbon gas in air below which there is insufficient hydrocarbon to support combustion.

Related Terms

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

AIR INFILTRATION

The leakage of air into a room through cracks in doors, windows, and other openings.

ARC

A flash, caused by an electric current ionizing a gas or vapor.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

CAM

Eccentric shaft used in most internal combustion engines to open and close valves.

OUTDOOR AIR

Air taken from outdoors and, therefore, not previously circulated through the system.

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

AIR

A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.
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