Main Page | See live article | Alphabetical index

Dry ice

Dry ice is a genericized trademark for frozen carbon dioxide. The term was coined in 1925.

Dry ice at normal pressures does not melt into liquid carbon dioxide but rather sublimates directly into carbon dioxide gas. Hence it is called "dry ice" as opposed to normal "wet (water) ice".

It is used for:

Dry ice is produced by compressing carbon dioxide gas to a liquid form, removing excess heat, and then letting the liquid carbon dioxide expand quickly. This expansion causes a drop in temperature so that some of the CO2 freezes to "snow" which is then compressed.