On a rainy day I try firing a pellet gun using helium instead of air. You may ask: "But how do some pellet guns get bullets faster than the speed of sound?" well some air molecules are going faster than the average speed, half of them in fact, and some pellet guns have a plunger that compresses the gas suddenly thus heating it and increasing the speed of the particles. Also I didn't use hydrogen because, though it would be even faster, holding a large bag of hydrogen mixed with air seemed a b