Answer :
Final answer:
A CO2 extinguisher can be used effectively on Class B and Class C fires. These fires involve flammable liquids, gases, and electrical equipment. The state of CO2 (liquid or gas) in the extinguisher is temperature-dependent.
Explanation:
A CO2 extinguisher can be used on Class B and Class C fires. These types of fires involve flammable liquids or gases and fires involving electrical equipment, respectively. The CO2 works by replacing the oxygen surrounding the fire with CO2, therefore, suffocating the fire and preventing it from spreading. It's important to note the temperature of the CO2 matters. On a cool day, the temperature of the CO2 is below the critical temperature of CO2, 31 °C, so liquid CO2 is present in the extinguisher. On a hot day, the temperature of the CO2 is above its critical temperature of 31 °C. Above this temperature no amount of pressure can liquefy CO2 so no liquid CO2 exists in the fire extinguisher.
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