Dry ice is not liquid nitrogen.
Difference between dry ice and normal ice: Dry ice don't melt, they
sublime. That is, you don't see water but you will see your dry ice
getting smaller and smaller. Dry ice will change into carbon
dioxide when they sublime, so make sure you have plenty of air in
your room or you die of carbon dioxide poisoning.
Another thing: don't touch dry ice. The minute they stick to your
skin, it is very hard to get them off. And it is very painful to
get the dry ice off. Use a newspaper to handle the dry ice (that's
the reason why you see ice always wrapped up)
