Sublimation (vaporisation) of dry ice

Sublimation (vaporisation) of dry ice

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Credit: MATT MEADOWS/SCIENCE PHOTO LIBRARY

Caption: Sublimation of dry ice. A fog-like vapour spills out of a glass beaker containing dry ice. Sublimation is the conversion of a solid directly to a vapour state by heating. Dry ice is solid carbon dioxide. Carbon dioxide is a colourless gas at room temperature but becomes a liquid under compression; if the liquid is allowed to expand rapidly to atmospheric pressure, it cools suddenly and freezes to dry ice. Dry ice sublimes (turns straight into a gas from the solid state) at -78.5 degrees Celsius (195 degrees Kelvin). If mixed with water it sublimes, as seen here, producing thick clouds of fog.

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Keywords: carbon dioxide, co2, dry ice, heat, physics, sublimation, temperature, thermal, thermodynamics, vaporisation, vaporising, vapour

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