Chemical properties of air

Obviously, air has more than four properties. However, this question is most likely inquiring about four basic properties of air that you could explain and demonstrate to a child to prove that it exists. That being said, the four most basic properties of air are:

• It takes up space.
• It has a measurable mass.
• It exerts pressure; i.e., it fills up whatever container it's in.
• Air has temperature

Note: Their are many types properties of matter these are only some.