Liquid nitrogen at the doctor

No real point to this but I wanted to post anyways because it is kinda cool.  Went to the doctors office with my wife today because she had this spot on her ear that was bothering her.  Well the doctor wanted to freeze it with liquid nitrogen to get rid of it.  Well of course my ears perked right up because to be honest this was going to be the same time I was even in the same room as this *cool* stuff.  I asked her to pack some up for me to take home.  She laughed and said she wished she could but did not have anything to transport it with.  But she brought in a styrofoam cup about half full of it.  She used a quetip to apply it to the spot on the ear three times.  Then handed me the cup and said "I know the geek inside you wants to play with it.".  Our doctor knows us well.  But the bummer part was that I did not have anything to put in it.  So since the only thing I had to freeze was myself I put the quetip on my finger.  ......Yes this hurt.  But it was still fun.  Then I was left to just watch it boil and then blow on it once in a while.  But when we were leaving I handed the cup back to her since I figured I could not leave with it and it was almost gone anyways.  Then she said something she liked to do with it was to pour it on the floor.  I was pretty cool to watch the "fog" it kicked up and listen to the floor crackle.


Anyways, that is my story of the day.  I did not get to do much with it, but it was still *cool*.

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resinipsa15 years ago
it`s very cool... I hope than your wife is not explose...))
lemonie5 years ago
It's fun, you can dip your hand in it (briefly), balloons, etc.
A nice experience for you.

L
kelseymh5 years ago
If you pour it out on a table top or the floor, besides the fog you'll also see droplets of it rolling around all by themselves. This is the Leidenfrost effect: the droplets evaporate (boil) so fast on their surface that they can levitate themselves on a cushion of vapor.

You can also drop (or dip) a strip of paper in it. If you wait several seconds, the paper will become as brittle as a dried leaf.
Is that the effect that allows you to put a small amount of liquid nitrogen on your tongue/skin without dying?
Maybe. It's the same effect as when you drop a bit of water onto a very hot skillet, the drop will jump around on the surface, sometimes for tens of seconds or more, without immediately disappearing, and without flowing out onto the surface.