- What makes matter? matter is anything which both occupies space and has mass is known as matter. Like water, rocks, cells and oranges. But is air matter?Mrs.Smith already show the air takes space, but we are not sure the air has mass. I check on internet. They tell me yes, air is matter. But how can we prove the air has mass.The wind can makes thing move. It show us the wind has momentum and kinetic energy. That is why air has mass. If the air has no mass. How can we measure atmospheric pressure.We also can prove the air has matter in hot air ballon. The air after heating, the density of the air will be smaller then go up. If the air has no mass. How can density be smaller and the hot air ballon go up.
