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| | Light gas gun - Wikipedia, the free encyclopedia |
 | | Light gas guns have been built that are capable of propelling projectiles at speeds of up to 7000 m/s--over 5 times the velocity of which small-bore firearms are capable. |
 | | The limiting factor on the speed of an airgun, firearm, or light gas gun is the speed of sound in the working fluid--the air, burning gunpowder, or a light gas. |
 | | In a light gas gun, the piston is powered by a chemical reaction (usually gunpowder), and the working fluid is a lighter gas, such as helium or hydrogen (hydrogen offers the best performance, as explained below, but helium is much safer to work with). |
| en.wikipedia.org /wiki/Light_gas_gun (749 words) |
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