what do you understand by air
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Gen. Chris Donahue
The Last American Soldier To Leave Afghanistan : NPR. The Last American Soldier To Leave Afghanistan U.S. Army Maj. Gen. Chris Donahue was the very last American service member to leave the country Monday. He's commander of the 82nd Airborne Division, XVIII Airborne Corps.
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Air is a mixture of many gases and tiny dust particles. It is the clear gas in which living things live and breathe. ... Air is a mixture of about 78% of nitrogen, 21% of oxygen, 0.9% of argon, 0.04% of carbon dioxide, and very small amounts of other gases. There is an average of about 1% water vapour.
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