DRY ICE

cold white substance formed from compressed and cooled carbon dioxide

Dry ice is the genericized trademark for solid carbon dioxide. It is commonly used as a versatile cooling agent. Dry ice sublimes, changing directly to a gas at atmospheric pressure. Its sublimation and deposition point is -78.5 °C (-109.3 °F). Its  enthalpy of sublimation (ΔHsub) @ -78.5 °C (-109.3 °F) is 199.0 kJ/kg (245.5 BTU/lb). The low temperature and direct sublimation to a gas makes dry ice a very effective  coolant, since it is colder than ice and leaves no moisture as it changes state.
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Noun
1. solidified carbon dioxide; dry ice sublimates at -78.5 C and is used mainly as a refrigerant
(hypernym) solid

dry ice
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