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| #REDIRECT [[air mass]] | | #REDIRECT [[Air mass]] |
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| {{Term
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| |Display title=air mass
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| |Definitions={{Definition
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| |Num=1
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| |Meaning=
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| #A widespread body of air, the properties of which can be identified as 1) having been established while that air was situated over a particular region of the earth's surface ([[airmass source region]]), and 2) undergoing specific modifications while in transit away from the source region.<br/> 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. The stagnation or long-continued motion of air over a source region permits the vertical temperature and moisture distribution of the air to reach relative [[equilibrium]] with the underlying surface. <br/>''See'' [[airmass classification]].<br/>
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| #In [[radiation]], the ratio of the actual path length taken by the direct solar [[beam]] to the analogous path when the sun is overhead from the top of the [[atmosphere]] to the surface.<br/> Extrapolation of surface measurements to zero air mass was the original method for estimating the value of solar [[irradiance]] at the top of the atmosphere.<br/>
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| #<br/>''See'' [[optical air mass]].
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