Vacuum Cannon

High speed footage of a ping pong ball, propelled by air rushing into an evacuated tube, penetrating three empty soda cans. The PVC tube is 8 feet long and 1.5 inches in diameter, with a layer of mylar sealing both ends. The ball accelerates down the tube from rest to over 650 mph, easily breaking through the mylar and the soda cans at the other end before disintegrating.

For more information on our setup, see
http://sciencedemonstrations.fas.harvard.edu/presentations/vacuum-cannon