Which chemical compound is known as dry ice?

The chemical compound known as dry ice is solid carbon dioxide.

Dry ice is carbon dioxide, CO₂, in its solid state. At ordinary atmospheric pressure, it does not melt into a liquid; instead, it sublimates, changing directly from a solid into a gas at about −78.5°C.

The name “dry ice” refers to the fact that it leaves no liquid puddle as ordinary water ice does. Its cold temperature and rapid sublimation make it useful for transporting frozen goods, creating theatrical fog, and cooling materials in some industrial and laboratory settings.

Dry ice must be handled with insulated gloves because it can cause cold burns. It should never be stored in a tightly sealed container, since sublimating carbon dioxide can build pressure. Dry ice is not frozen water and should not be confused with liquid nitrogen, which is a different substance.