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Jets of liquid carbon dioxide. Liquid carbon dioxide is the liquid state of carbon dioxide (CO 2), which cannot occur under atmospheric pressure.It can only exist at a pressure above 5.1 atm (5.2 bar; 75 psi), under 31.1 °C (88.0 °F) (temperature of critical point) and above −56.6 °C (−69.9 °F) (temperature of triple point). [1]
Carbon dioxide liquid/vapor equilibrium thermodynamic data: Temp. °C P vap Vapor ... Density of liquid g/cm 3 S liq Entropy liquid J/mol-°C S vap Entropy vapor J ...
At standard temperature and pressure, the density of carbon dioxide is around 1.98 kg/m 3, about 1.53 times that of air. [27] Carbon dioxide has no liquid state at pressures below 0.51795(10) MPa [2] (5.11177(99) atm).
Carbon dioxide density-pressure phase diagram Figures 1 and 2 show two-dimensional projections of a phase diagram . In the pressure-temperature phase diagram (Fig. 1) the boiling curve separates the gas and liquid region and ends in the critical point, where the liquid and gas phases disappear to become a single supercritical phase.
Carbon dioxide usually behaves as a gas in air at standard temperature and pressure (STP), or as a solid called dry ice when cooled and/or pressurised sufficiently. If the temperature and pressure are both increased from STP to be at or above the critical point for carbon dioxide, it can adopt properties midway between a gas and a liquid.
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The density of dry ice increases with decreasing temperature and ranges between about 1.55 and 1.7 g/cm 3 ... When this occurs some liquid carbon dioxide vaporizes ...
Liquid carbon dioxide can be stored at ambient temperatures, unlike Liquid air energy storage (LAES), which must keep liquid air cold at −192°C, though the CO 2 does need to be kept pressurised. Liquid CO 2 has a much higher energy density (66.7 kWh/m 3 ), than compressed air in typical to compressed-air energy storage (CAES) systems (2-6 ...