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The possiblity of a HAND-HELD freeze ray is completely absurd, (heres looking at you bovine), however, a freezing tank could be plausible. Using that chemical that freezes things quikly,(Liquid Nitrogen? I forget), people and objects, mostly vehicle motors I suppose could be frozen. Though at the moment
it may seem a little absurd when you could easily blow stuff up, but if there ever is a shortage of materials for shells, chemical can be made again and again...
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This is already available in a lot of ways, but not really useful. The easiest one to get is a can of "air" for dusting computer keyboards, available in the electronics department of Wal-Mart, for instance. Turn it upside-down and it shoots out a blast of very cold liquid that evaporates before it has gone more than a foot or so. I think it is CO2, but I'm not sure. A CO2 fire extinguisher can freeze things, and looks a lot like that. I've never used a dusting can to freeze anything, though. |
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Your big heat changes come with phase changes. So you're best off with a product that changes phase as it comes out of the can - for maximum freezing power. |
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Some of the lighter refrigerants are probably the most useful, with the old favourite Freon probably being the most useful. Except for the whole ozone-depletion thing. |
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What I'm saying is - compressed CO2 in a can has no-where near the heat capacity as liquid CO2, or liquid anything that's going to evaporate quickly. |
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Liquid nitrogen can't be kept that way without a Dewar, so that's never going to happen, even though it's nice and cold. As I said before, look at some of the lighter halogenated hydrocarbons and there'll be some suitable. |
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Otherwise, use something like liquid ethane. Should do a good job of freezing stuff, then if you really want to do bad things, set fire to it after you're done freezing the bad guys. |
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Ammonia has good stats in that respect. |
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