What are three properties of air

The three properties of air are weight, mass, and density.

Air is a mix of gases that is composed out of about 1/5 oxygen and 4/5 nitrogen. Though air is made up of mostly nitrogen and oxygen, it also contains traces of water vapor, argon, carbon dioxide and other substances. The pressure of air depends on the location as well as the season. The air pressure can change in a matter of minutes due to many factors.