Air drill
a drill powered by compressed air.
Historical Examples
The more recent forms perform the same amount of work as the air drill, with a consumption of about one-tenth the power.
Every-day Science: Volume VI. The Conquest of Nature Henry Smith Williams
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to drop (persons, equipment, etc.) by parachute from an aircraft in flight. the act or process of airdropping. Contemporary Examples The airdrop mission consisted of a C-17 and two C-130 aircraft that were escorted by two F-18 fighters. Obama’s Iraq Plan Has a Killer Flaw—and Airstrikes Alone May Not Save It Jacob Siegel August 7, […]
- Air duct
an enclosure, usually of sheet metal, that conducts heated or conditioned air. Historical Examples Nerve and air duct, therefore, are the essentials; the rest is so much material in reserve for the process of the metamorphosis. The Life of the Fly J. Henri Fabre Thus the efficiency of fireplaces may be materially increased, the degree […]
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noun the presence in the tissues and blood of a gas, such as air or nitrogen bubbles, caused by an injection of air or, in the case of nitrogen, by an abrupt and substantial reduction in the ambient pressure See decompression sickness Historical Examples Danger from air embolism is exceedingly doubtful, unless great quantities were […]
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noun an engine that uses the expansion of heated air to drive a piston a small engine that uses compressed air to drive a piston Historical Examples The air engine would in many respects possess advantages over the steam engine, if it could be worked economically. Great Facts Frederick C. Bakewell
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a measure of the effectiveness of a material in absorbing nuclear radiation, expressed as the thickness of an air layer (at 0° C and 1 atmosphere) causing the same absorption.