a body of air covering a relatively wide area, exhibiting approximately uniform properties through any horizontal section.
Besides those who have pinned their faith to the thicknesses, there are those who take up with the “air mass” theory.
Antonio Stradivari Horace William Petherick
a large body of air having characteristics of temperature, moisture, and pressure that are approximately uniform horizontally
A widespread body of air that originates over a large area of land or ocean and assumes the temperature and humidity of that area, with characteristics distributed fairly evenly throughout the horizontal layers of the mass. Air that stands over the Caribbean Sea, for example, becomes a warm, humid maritime tropical air mass, while air that lies in the Arctic regions of northern Canada takes on the cold and dry characteristics of its surroundings and becomes a continental polar air mass. When air masses of differing properties come into contact in the middle latitudes, they frequently generate storm fronts.
- Air mattress
a mattress, usually of plastic or rubber, that can be inflated for use, as in camping, and deflated for storage. Contemporary Examples That night, she says, she had too much to drink, so she wandered into one of the back bedrooms and fell asleep on an air mattress. Former Student Claims U.S. Naval Academy Had […]
- Air material command compiler
air material command compiler language (AIMACO) A modification of FLOW-MATIC. AIMACO was supplanted by COBOL. [Sammet 1969, p. 378]. (1995-02-20)
- Air medal
an award for heroism or meritorious action involving an aerial military operation: personnel from any branch of the U.S. armed forces are eligible. Historical Examples By now I had flown ten missions and was entitled to receive the Air Medal. The Biography of a Rabbit Roy Benson
- Air meter
a small, sensitive anemometer of the windmill type.