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Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
Hi, I used to (w while back) freeze things with an upside-down compressed air can (while wearing gloves for frostbite, and safety glasses if the object frozen would smash, or act like a hammer [bananas])... but it has been a while, and my temperature probe is broken, so if I may ask, does anyone here have an idea of the temperature of the gas (I know it is not air, and there are a few different ones and mine is tetraflouroethane) escaping is at?
Note: I do not recommend trying this stunt... I admit, I was stupid doing it, even with the precautions, but I am just curious having remembered recently about it while watching it being done on "Burn Notice" with my dad who has to catch up before the season starts back.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
Chris wrote ...
About -25°C, the boiling point of 1,1 difluoroethane.
but it comes out as a liquid, and it's tetra-, not di- (not too much of a difference in boiling points though, at -26.3°C)...
I found some temperature probes for a multimeter today while looking for some new test equipment, would these work? (it is like the probe on this page:
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
Of course it comes out as a boiling liquid. If you heated a can of water to 150°C, turned it upside down and opened it, the same thing would happen, except it would come out at 100°C instead of -25. The phase change always occurs at a constant temperature if the pressure is fixed (1atm in this case).
Also, difluoroethane is more commonly used in canned "air" than tetrafluoroethane. It has half as much fluorine per mole, which makes it roughly half as expensive.
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Compressed Air cans.
