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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