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air plant

(Encyclopedia)air plant: see epiphyte.

air pollution

(Encyclopedia)air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...

heating

(Encyclopedia)CE5 Typical warm-air heating system heating, means of making a building comfortably warm relative to a colder outside temperature. Old, primitive methods of heating a building or a room within it ...

cooling system

(Encyclopedia)cooling system: see air conditioning; internal-combustion engine; refrigeration. ...

Springdale

(Encyclopedia)Springdale, city (1990 pop. 29,941), Benton and Washington counties, NW Ark.; inc. 1878. It is a poultry-processing center, and there is vegetable canning, printing, and the manufacture of air conditi...

ventilation

(Encyclopedia)ventilation, process of supplying fresh air to an enclosed space and removing from it air contaminated by odors, gases, or smoke. Proper ventilation requires also that there be a movement or circulati...

air traffic control

(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...

Strategic Air Command

(Encyclopedia)Strategic Air Command (SAC), former command of the U.S. air force (see Air Force, United States Department of the) charged with organizing, training, equipping, administering, and preparing strategic ...

air-cushion vehicle

(Encyclopedia)CE5 Air-cushion vehicle: In vehicles modified with a trunk or skirt (A), the rate of leakage is reduced and less power is needed to maintain the cushion. Vehicles designed to travel over deep water...

Gateshead

(Encyclopedia)Gateshead gātsˈhĕd [key], metropolitan borough, NE England, on the Tyne River opposite ...