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Air Sac , air sac compressed air , compressed air Air under pressure. This may be used in tunnels to balance the pressure of water in the ground and so control groundwater. Compressed… air lock , air lock, compartment connecting two different environments, usually at different pressures, that enables personnel to transfer from one environment… Air Bag , Background
An air bag is an inflatable cushion designed to protect automobile occupants from serious injury in the case of a collision. The air bag i… Arctic air , arctic air Very cold air mass, generally formed north of the Arctic Circle. As air from this source moves southwards, it cools the regions in which i… United States Air Operations , World War II, U.S. Air Operations in: The Air War in Europe. U.S. air operations in the Mediterranean and Europe evolved into two distinct fields of…
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air pocket