Uploaded March 2017 | Updated September 2026, 3 weeks ago

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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. See my earlier video for how to build a manual vacuum pump: youtu.be/UkPLu6mgdWA
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