'air' can also refer to...


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1 A mixture of gases that makes up the Earth's atmosphere. It comprises about 78% nitrogen, 21% oxygen, less than 1% of carbon dioxide and other gases, and varying amounts of water vapour that humans and other organisms require for breathing.

2 The region above the ground, also known as the sky or atmosphere.

Subjects: Meteorology and Climatology — Environmental Science.

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