Air is Matter Video

Do your students ever have trouble understanding the idea that air is matter? 

This video should help in only 90 seconds!

Check out this video I made called "Swimming in an Ocean of Air" which explains why air is matter. 




You will see a demo where I have evacuated the air from a vacuum chamber.  The chamber is on a scale, and when I let the air back in, you can see how much the air in the chamber weighs. 

By the end, I should convince you that air is matter. It is a physical substance that takes up space and indeed, has mass. 

And on top of all that, using physics, I answer the philosophical question: 

Is the glass half empty or half full?