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Freeze!

literally
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The magazine of an air gun is cooled with liquid nitrogen or liquid helium. the gun shoots supercooled bullets that would stop muscle movement. it would be good for hostage situations and against body armor
AlexTheGreat, Jul 25 2006

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       The magazine of an air gun is cooled with liquid nitrogen and the shock waves from an exiting round shatter the metal :)
angel, Jul 25 2006
  

       it's a compressed air gun, no explosions or shockwaves
AlexTheGreat, Jul 25 2006
  

       No shockwaves? Just by changing the nature of the propellant? Just different shock waves.
normzone, Jul 25 2006
  

       Not clear why a supercooled bullet would stop muscle movement any more effectively than a metal one. Please explain.   

       If you're thinking a super-cooled bullet will freeze the muscle tissue around it, it won't do so any faster than a tranquilizer dart will subdue the target, i.e., too slowly to stop him/her shooting hostages, detonating a suicide bomb, etc.   

       Bad science/magic technology all around.
DrCurry, Jul 25 2006
  

       why would it be good against body armour? just more thermal insulation. Do you know anything about specific heats or thermal mass? To freeze or numb any large amuscles, you'd need either a) a small projectile with a huge specific heat that is very cold, or, b) a very large, very cold projectile made of normal materials. And whatever you use, a solid projectile would simply take too long to numb a muscle. and why is supercooling the barrel better than having a pre-supercooled projectile fired from a regular barrel?   

       And yes, judging by the thickness of the steel in most air gun barrels, there is some loading. I'm not sure shockwave is the right term, but some pretty high transient stresses. Expect a supercooled barrel to shatter.   

       I think reduced lethality lead-filled beanbag shotgun rounds would be far more reliable for immediate numbing of the target area. and they're baked too.   

       Or even a big taser gun. Oh hell, there's been lots of research into reduced lethality devices, and I'm not aware of any system using "cold" as the damaging energy. If something produces enough thermal flux to incapacitate someone very quickly, it'll probably cause massive frostbite and/or death. [/end rant/]   

       -
Custardguts, Jul 27 2006
  
      
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