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The reduced pressure causes the liquid CO2 in the extinguisher to boil. This lowers the temperature and some is converted into a solid. This can be used to make small quantities of dry ice in the lab.

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rmouk

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3y ago
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11y ago

There is no fire extinguisher that forms solid CO2 ("dry ice") when activated. Some extinguishers may form water ice from water vapor in the air.

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Q: Why does a fire extinguisher form solid CO2 when it is activated?
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