airmass

Noun

 * 1)  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.
 * 2)  The amount of air through which light from a celestial object passes, normalized to 1 for an object at zenith.

Translations

 * Chinese:
 * Mandarin:
 * Dutch: lucht massa
 * Finnish:
 * French: mass d'air
 * German: luftmasse
 * Hungarian:
 * Indonesian:
 * Malay: jisim udara
 * Maori: hau whakapipi
 * Portuguese: massa de ar
 * Russian: масса воздуха
 * Spanish: masa de aire
 * Swedish: luft massa
 * Turkish: