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This t-shirt cannon is very similar to a potato cannon, as seen in How Spud Guns Work. The advantage of a potato cannon is that it fires much farther. The disadvantage is that it takes a lot longer to reload a conventional potato cannon because you have to open it up refuel it. That problem could probably be solved with a small butane tank…
The boiling point of water decreases as altitude increases — generally, this temperature decreases by one degree for every 540 feet of altitude. Learn more about cooking at high altitudes in this podcast from HowStuffWorks.
A barometer measures air pressure, and indicates changes in pressure by rising or falling. Learn more about air pressure and barometers in this HowStuffWorks podcast.
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