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Carbon dioxide in solid form. It is a dense, colourless substance, resembling compressed snow, that at normal atmospheric pressure passes directly from solid to vapour (seesublimation) at 109.3 °F (78.5 °C). Commonly available in blocks, it is used chiefly to keep foods, vaccines, and other perishable products cold during shipping or storage.
This entry comes from Encyclopædia Britannica Concise. For the full entry on dry ice, visit Britannica.com.