Or, poor man's liquid nitrogen. I'm in college, but unfortunately no chem classes, nor do I have the money for a Dewar's of my own to have filled. I heard of this technique from a friend of a teacher's son's maid..or something, it was a while ago.
Full credit for this idea belongs to wbeaty over ar Youtube,http://www.youtube.com/watch?v=d11TFkeqbwY
I'm just the instrustables messenger;)
Step 1: Supplies
- Two pop bottles or equivalent. (1 2L, one 354ml or whatever the personal size ones are)
- Dry ice(Pellets probably are the best option)
-99% isopropyl alcohol( Can be found at most grocery/drug stores.)
-Something sharp to cut the bottles apart with.
Step 2: Cut Bottles.
Cut the top of the big bottle off about 2 thirds of the way down. i tested multiple depths, and something that the small container barely peeks over seems good.
The smaller container needs to be cut to about the same height, ensure that by testing the smaller container inside the larger.
Step 3: Prepare inside container!
Cut some small holes in the bottom of the inside container. This will allow the alcohol to get chilled by the dry ice while keeping the cry ice away from your test subjects. Accuracy is not an issue, just make it smaller than your smallest chunk of dry ice.
Step 4: Pack it in.
Put some dry ice in the bottom of the container, add the inner bottle, and fill it in around the sides. I tried to just fill it, and work the bottle in, but it DOES not work for anything. Crushing the dry ice yields more uniform results, at the cost of faster sublimation. (turning into useless vapor)
Step 5: Add the Alcohol.
Pour alcohol into both sections of the container, the levels should even out eventually. Odds are you won't be able to see very well where the alcohol is, and spill a little. This is good. It lets you know the container is full.