air mass

== English == === Alternative forms === airmass === Etymology === From air +‎ mass. Perhaps a calque of German Luftmasse. === Pronunciation === (UK) IPA(key): /ˈɛː mas/ (US) IPA(key): /ɛəɹ mæs/, /ɛːɹ mæs/ === Noun === air mass (plural air masses) (physics, meteorology) a widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated over a particular region of the Earth's surface (airmass source region) and (b) undergoing specific modifications while in transit away from the source region. An air mass is often defined as a widespread body of air that is approximately homogeneous in its horizontal extent, particularly with reference to temperature and moisture distribution; in addition, the vertical temperature and moisture variations are approximately the same over its horizontal extent. (astronomy) The amount of air through which light from a celestial object passes, normalized to 1 for an object at zenith. ==== Translations ==== === See also === air mass classification airmass source region Source: FM 3-6 Field Behavior of NBC Agents. === References === “air mass”, in OneLook Dictionary Search. air mass on Wikipedia.Wikipedia === Anagrams === Marissa, Massari