Question

Define air

Answer 1

Air typically contains dust, pollen, and spores. Other contaminants are referred to as air pollution. On another planet (e.g., Mars), the "air" would have a different composition. There is no air in space.

Older Air Definition

Air is also an early chemical term for a type of gas. Many individual "airs" made up the air we breathe. Vital air was later determined to be oxygen, phlogisticated air became nitrogen. An alchemist might refer to any gas released by a chemical reaction as its "air."