air mass

Etymology
Perhaps a.

Noun

 * 1)  A particular volume of air, especially one having a roughly uniform temperature, pressure and water vapour content.

Translations

 * Catalan: massa d'aire
 * Chinese:
 * Mandarin:
 * Finnish:
 * French:
 * German:
 * Hungarian:
 * Japanese:
 * Norwegian: luftmasse
 * Romanian: