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------------------------------------------------ Carbon Dioxide (CO2) extinguishers are rated for which classes of fire?

CO2 extinguishers are rated for Class B and C fires. They work by displacing oxygen, thus extinguishing the fire. The presence of liquid or gaseous CO2 is dependent on the temperature.

Explanation:

Carbon Dioxide, or CO2 extinguishers, are typically rated for Class B and Class C fires. Class B fires are those sparked by flammable liquids, while Class C fires involve electrical equipment. The CO2 in these extinguishers works by displacing oxygen, thus smothering the fire and preventing it from receiving the fuel it needs to keep burning. Further, the temperature difference in relation to CO2 extinguishers pertains to the critical temperature of CO2, which is 31 °C. On a cooler day, the temperature of the CO2 inside the extinguisher is below this critical temperature, meaning it exists as a liquid. However, on a hotter day exceeding this temperature, the CO2 will not condense into a liquid, regardless of pressure, hence why it may seem like the extinguisher is 'empty.'

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