Hi All
>
>
Several posts have mentioned using liquid nitrogen but none have
mentioned specific hazards. These hazards are unknown to me other
than the fact that it is cold and Bob H's comment about a hole in the
stopper(the stuff boils at -321F). I copied the following from
Wikipedia. Dumping out your coffee from your lunch pail thermos and
filling it with liquid nitrogen is probably not a good idea.
At atmospheric pressure, liquid nitrogen boils at 77 K (−196 °C;
−321 °F) and is a cryogenic fluid which can cause rapid freezing on
contact with living tissue, which may lead to frostbite. When
appropriately insulated from ambient heat, liquid nitrogen can be
stored and transported, for example in vacuum flasks. Here, the very
low temperature is held constant at 77 K by slow boiling of the
liquid, resulting in the evolution of nitrogen gas. Depending on the
size and design, the holding time of vacuum flasks ranges from a few
hours to a few weeks.
Bob Darrell
Caledon Ontario
Canada
44N80W
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