Question

Which of the following is a known property of air​

Answer 1

Explanation:

Air has mass, air occupies space and air expands when heated are all properties of air.

Answer 2

Answer:

Mass and Mixture of Gases

And even though you can't see it, air has a lot of atoms and molecules. Air is a gas (as opposed to a liquid or a solid) and contains about 78% nitrogen, 21% oxygen, and 1% argon. There are other trace gases in air, like helium, carbon dioxide, and neon, just to name a few.

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