A potato gun can provide endless hours of family friend. They are not hard to make and not hard to understand the physics behind it. First, you need to buy 2-inch and 3-inch PVC pipes with a connector and some PVC glue. Connect the two pipes with the connector and seal the edges with glue. Next, drill a small hole in 3-inch pipe and insert a fire grill igniter. Use a file or dremel to sharpen the end of the barrel so that the potato will be cut to size when you insert a potato. Now, after the glue is dry, the gun is ready to be fired. Spray a propane-based aerosol down the pipe. Put the cap back on and take aim. Press the igniter button and watch the potato fly out of sight. This happens because the aerosol is ignited and the internal explosion sends the potato out the other end of the pipe. A potato gun is a fascinating feat of physics and its loads of fun.
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