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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
When I was in medical school we were scooping ladles of liquid nitrogen out of a container. I remember seeing liquid dripping from the bottom of the ladle and evaporating when it hit the floor. Does anyone know what gas this could have been? Was the cold from the liquid nitrogen condensing other gases from the atmosphere, or was this the nitrogen creeping over the top?
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Liquid nitrogen isnt a superfluid , so it should stay put in the ladle. Oxygen liquefies above the temp of LN2, so it possibly could have been that. Did it have a blue tint to it?
Ive also seen a prof. condense a few mL of LO2 in a test tube in a thermos of LN2, and dump it on a small bundle of smoldering steel wool. I cracked the pyrex beaker and scorch the table. Fun stuff.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Oxygen condensing on the outside of pipes carrying liquid nitrogen is considered to be very bad news. It's a serious fire risk if it drips onto anything organic (vinyl floor tiles, a thrown-down lab coat). People installing piped LN2 systems have to jump through a lot of safety hoops to address the risks properly.
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A ladle full of liquid nitrogen
