Liquid carbon dioxide
liquid state of the compound carbon dioxide
Liquid carbon dioxide is the liquid form of carbon dioxide (CO2). At normal atmospheric pressure, carbon dioxide can only exist as a gas or solid, and is ordinarily found as a trace gas in Earth's atmosphere. Its liquid state can exist at pressures above 5.1 atm (5.2 bar; 75 psi), between the temperatures of its triple point, −56.6 °C (−69.9 °F) and its critical point, 31.1 °C (88.0 °F). Solid CO2, known as dry ice, occurs at low temperatures, and has commercial applications. Dry ice sublimes above −78.5 °C (−109.3 °F) at atmospheric pressure—that is, it transitions directly from solid to gas without an intermediate liquid stage. The uses and applications of liquid carbon dioxide include extracting virgin olive oil from olive paste, in fire extinguishers, and as a coolant. With supercritical carbon dioxide, liquid carbon dioxide is used for decaffeinating coffee.
Properties
Liquid carbon dioxide is a type of liquid which is formed from highly compressed and cooled gaseous carbon dioxide. It does not form under atmospheric conditions. It only exists when the pressure is above 5.1 atm and the temperature is under 31.1 °C (88.0 °F) (temperature of critical point) and above −56.6 °C (−69.9 °F) (temperature of triple point).
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This entry incorporates text from “Liquid carbon dioxide” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.