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The state is dependent upon the temperature. At 70 degrees F and below, some of the carbon dioxide is in the form of a liquid, with some vapor. If the temperature exceeds 88 degrees F (the critical temperature of carbon dioxide), the liquid phase disappears, and the contents of the extinguisher is vapor.

The majority of the CO2 stored in a fire extinguisher is a liquid under pressure of more than 5 atmospheres.

The boiling temperature of carbon dioxide is 70 degrees Fahrenheit BELOW zero at 5.2 bar (about 73 psi), meaning it is liquid or supercritical fluid at room temperature if it is compressed at more pressure than that.

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Q: What is the state of the carbon dioxide in a carbon dioxide fire extinguisher?
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