I have a Thermos flask filled with liquid nitrogen.

What are the chances of using liquid nitrogen to get me a girlfriend?

"Why hello thar.....wanna see what I can do with a banana and some liquid nitrogen?"
 
You can genuinely put your hand in it...

Disclaimer: don't!

My first meeting with my personal tutor at uni in the physics labs, he brought out a thermos of liquid nitrogen and said "put your hand in, but only for a short time". I'm talking about 1sec max.

Physics explanation: the warmth of your hand (or other appendages if you felt daring) condenses the nitrogen surrounding your hand creating a thin insulating layer protecting your hand
 
Apparently, you can pour it onto your hand with few ill effects....it's just bloody cold.

However, immersing your hand for too long will cause serious harm.

Im off to bed now...if the container hasn't exploded by morning, I might try some japes with it.
 
This reminds me so much of the great mercury thread and someones golden suggestion of "pour it through a letter box and shout "SARAH CONNOR!!"".

Absolute class.
 
Stick your hand in it, then walk into the living room and say "I'm going to bed now. I'm shattered" just as you smack your hand on the door frame. :)
 
Has the OP survived the night?
The trouble with liquid nitrogen is that it expands to 85 times it's volume when reverting back to gas, so 2lt will give you quite a blanket of Nitrogen which will reduce the oxygen content of a room.
 
Im still alive. Thermos is in one piece. I just unscrewed the lid and there as hardly any pressure release, and the level of nitrogen hasn't gone down much.
 
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