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What is the difference between a railgun and a coilgun? Which

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What is the difference between a railgun and a coilgun? Which one is more efficient?
>>
Also, if you had a cylinder filled with a gas like hydrogen, and you had a piston at one end with an explosive on the other side, and the velocity of the explosive's detonation was higher than the gas's speed of sound, what would happen?
>>
Selfbump
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>>7964408
>What is the difference between a railgun and a coilgun?

Wikipedia it. One uses rails, the other one or many coils.

>and the velocity of the explosive's detonation was higher than the gas's speed of sound, what would happen?
Piston travels down tube and compresses gas, you just described a Light-Gas gun which you can also wikipedia for details.

Why ask retard central something when you can wikipedia it instead?
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>>7964429
>faster than the gas's speed of sound
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>>7964449
I had already read those articles.
I was confused about the light gas gun; I get now that the explosion has to be supersonic.
But with railgun/coilgun, which one is (can be) more efficient?
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