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/*/

air

/ɛː/

mass

/mas/

Description

air mass widespread body of air approximately homogeneous in its horizontal extent with vertical temperature and moisture variations that are approximately the same over its horizontal extent

air mass term

air mass optical path length through Earth’s atmosphere for light from a celestial source

English Phonetic Transcription

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British pronunciations are compiled from various sources (wiktionary etc.), including parts of speech.
American pronunciations are compiled from various sources (CMU pronunciation dictionary, wiktionary, etc.), including parts of speech.