Dry Ice 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 where mechanical cooling is unavailable.

Carbon Dioxide (CO₂) is in its solid state which is called 'Dry Ice'. At −78.5 °C (−109.3 °F),  It comprises of two oxygen atoms bonded to a single carbon atom. Dry ice has the feature of sublimation, where it can change from solid state to the gas state with no intervening liquid form. The atmosphere contains about 0.035% of this gas. co₂ is a greenhouse gas.