Dry ice, sometimes referred to as "Cardice" or as "card ice" (chiefly British English), is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere). It is useful for preserving frozen foods, ice cream, etc., where mechanical cooling is unavailable.
The extreme cold makes the solid dangerous to handle without protection due to burns caused by freezing (frostbite). While generally nontoxic, the outgassing from it can cause asphyxiation due to displacement of oxygen in confined locations.
http://en.wikipedia.org/wiki/Dry_ice
Funny, I thought it was the sun that made us hot and not co2. Co2 cools our drinks.
