Josh was Teaching the teacher something that certainly surprised her.
I made this compressed air cannon with a bit of help from my dad. As you pump the pressure builds up in the chamber. Then you turn the tap and release the pressure and it fires a nerf bullet or a bb bullet. I like to pump it up to 30 to 50 psi. 30 psi is the same as one car tyre. If you dont know what psi means I will tell you. psi meanpounds per square Inch (measure of pressure). Parts of the cannon are: pump ,valve ,chamber ,tap and barrel.
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