air mass -
a large body of air with uniform characteristics horizontally
atmospheric state,
atmosphere the mass of air surrounding the Earth; "there was great heat as the comet entered the atmosphere"; "it was exposed to the air"
high a lofty level or position or degree; "summer temperatures reached an all-time high"
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Wiktionary
Substantiv
air mass -
A widespread body of air, the properties of which can be identified as.
air mass -
Having been established while that air was situated over a particular region of the earth's surface airmass source region and.
air mass -
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.
Wikipedia
For airmass in astronomy and photovoltaics, see airmass. In meteorology, an air mass is a large volume of air defined by its temperature and water vapor content. Air masses cover many hundreds or thousands of square miles, and adopt the characteristics of the surface below them.
OmegaWiki Dictionary
Ω
air mass A large body of air having similar horizontal temperature and moisture characteristics.
