ᴡʜᴀᴛ ɪs ᴛʜᴇ ᴅᴇғɪɴᴀʀɪᴏɴ ᴏғ ᴀɪʀ ?
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the mixture of gases that surrounds the earth and that people, animals and plants breathe
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Air is the invisible mixture of gases that surrounds the Earth. ... Standard Dry Air is the composition of gases that make up air at sea level. It is a standard scientific unit of measurement. Standard Dry Air is made up of nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen, and xenon.
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