A Powerful Large Bore Vacuum Cannon That Uses the Earth’s Atmospheric Pressure to Fire Projectiles

Watermelon Vacuum Cannon

Ben from NightHawkInLight demonstrates how to construct a powerful large bore vacuum cannon that uses the Earth’s own atmospheric pressure to fire projectiles.

In this video I show how to make a large vacuum cannon with a 4 inch bore. Vacuum cannons are a classic science experiment used to demonstrate atmospheric pressure, though very rarely are they made as large as this. My ammunition is 3 inch PVC end caps, and atmospheric pressure is the only force responsible for firing them.

Glen Tickle
Glen Tickle

Amelia's dad. Steph's husband. Writer, comedian, gentleman. Good at juggling, bad at chess.