Tiny Soda Gun

I built this tiny baking soda and vinegar gun in September 2008. To my knowledge, it is the smallest purpose built working baking soda and vinegar gun in the world. It is only 1 3/8 inches long and 1 inch high. It uses about 1 milliliter of vinegar and 500 milligrams of baking soda per shot. If the conditions are right, it can shoot the cork at over 50 feet per second.