Two pieces of potato are pressed into the two ends of a PVC pipe. A rod with diameter nearly the same as the inner diameter of the pipe is used as a piston of the gun. Use the rod to push the potate on one end of the pipe so that the air in the pipe between the two pieces of potato is compressed. The pressure of the compressed air is high enough to shoot the potato on the other end of the pipe to a very far distance.
|PVC pipe and potato