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 (see sublimation) 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.
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