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air mass

(Encyclopedia) air mass, large body of air within the earth's atmosphere in which temperature and humidity, although varying at different heights, remain similar throughout the body at any one height…

Aïr Massif

(Encyclopedia) Aïr Massif or Aïr Mountains, Africa: see Sahara.

air navigation

(Encyclopedia) air navigation, science and technology of determining the position of an aircraft with respect to the surface of the earth and accurately maintaining a desired course (see navigation…

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…

air bag

(Encyclopedia) air bag: see automobile.

air bladder

(Encyclopedia) air bladder, in fish: see swim bladder.

air brake

(Encyclopedia) air brake: see brake.

air cargo

(Encyclopedia) air cargo: see aviation.

air conditioning

(Encyclopedia) CE5 Cross section of air conditioning unit. air conditioning, mechanical process for controlling the humidity, temperature, cleanliness, and circulation of air in buildings and…