Re: freeze guns

In sci.physics, jimp@xxxxxxxxxxxxxxxxxxxx
<jimp@xxxxxxxxxxxxxxxxxxxx>
wrote
on Thu, 03 Apr 2008 18:55:03 GMT
<halfc5-6dk.ln1@xxxxxxxxxxxxxxxx>:
uri <danny99@xxxxxxxxxxxx> wrote:
Is it theoretically possible to create nuclear-powered freeze guns
like that of Captain Cold?

No, though a liquid nitrogen squirt gun would work fairly well if
you could keep it from shattering from cold embrittlement.

One might also have a few other little problems.

[1] Presumably, the liquid nitrogen will freeze the water
vapor as it comes out of the nozzle, and clog the nozzle
in humid environs. The obvious solution to this might
be a heated nozzle (but see #2).

[2] The gun will of course get cold and explode unless the
reservoir is vented. It gets cold because it absorbs heat
from the air or one's hand, and it explodes because the
nitrogen evaporates, building up pressure much like a steam
engine. Presumably this can be forestalled somewhat by
very good insulation -- hence the traditional Dewar's flask
for carrying liquid nitrogen, oxygen, or air, trying to
reduce all three forms of heat transference -- conduction,
convection, radiation. Of course venting the reservoir
over long periods will eventually result in the loss of the
"bullets". The good news: this pressure might be utilized
to eject the liquid nitrogen, as the liquid nitrogen will
simply settle to the bottom and then can be piped to the
firing mechanism through insulated tubing. The bad news: I
have no idea how one would properly regulate this pressure.

[3] The resulting ice on the gun may make life interesting.
Presumably the main problem will be pain to the hand,
though if it's bad enough the gun might get *stuck* to
the hand and require hot water for its removal (frostbite).
If the nitrogen is in an external backpack tank, one might
have issues with the user's back getting painfully cold, though
that can be easily enough forestalled by additional clothing
layers.


Maybe if you spent more time reading real books instead of comic books
Canada might let you in.


Not sure how effective a liquid nitrogen "freeze gun" would
be in Canada; it's already pretty cold up there. ;-)

--
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