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**Dry ice** is the solid form of carbon dioxide and is commonly used for cooling purposes. It is especially useful for preserving frozen foods or materials in situations where traditional refrigeration is not available. Dry ice sublimates, or changes directly from a solid to a gas, at −78.5 °C under normal atmospheric pressure, without transitioning through a liquid phase — hence the name "dry ice". Compared with regular water ice, dry ice provides more than twice the cooling energy by weight and three times the cooling energy by volume.
