Air mass
a body of air covering a relatively wide area, exhibiting approximately uniform properties through any horizontal section.
historical examples
besides those who have pinned their faith to the thicknesses, there are those who take up with the “air m-ss” theory.
antonio stradivari horace william petherick
noun
a large body of air having characteristics of temperature, moisture, and pressure that are approximately uniform horizontally
air m-ss
a widespread body of air that originates over a large area of land or ocean and -ssumes the temperature and humidity of that area, with characteristics distributed fairly evenly throughout the horizontal layers of the m-ss. air that stands over the caribbean sea, for example, becomes a warm, humid maritime tropical air m-ss, 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 m-ss. when air m-sses of differing properties come into contact in the middle lat-tudes, they frequently generate storm fronts.
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