a compressed air pop-gunuse a straight piece of


A compressed air pop-gun

Use a straight piece of glass or plastic tubing of 1 or 2 cm in diameter and 15 or 20 cm in length. Make a piston by twisting some string on a pencil till it fits strongly in the tube. Put a small cork in the finish of the tube and push the piston in quickly

 

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Science: a compressed air pop-gunuse a straight piece of
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