Answer :
Final answer:
The choice of portable fire extinguisher depends on the type of fire and its fire class rating. The extinguisher's temperature also influences its state.
Explanation:
When selecting a portable fire extinguisher, the most important factor to consider is the type of fire and the fire class ratings of the extinguisher. It is imperative to know that not all fire extinguishers work on every type of fire. For instance, an extinguisher rated for an electrical fire (Class C) may not be effective on a grease fire (Class B).
Additionally, the solution referenced talks about the temperature of the extinguisher. Specifically, it mentions how CO2 in a fire extinguisher may exist as a liquid or not, depending on the temperature. If the temperature of the CO2 is below its critical temperature of 31 °C, liquid CO2 is present in the cylinder. Conversely, if the temperature of the CO2 is greater than its critical temperature, no amount of pressure can liquefy CO2, and therefore, no liquid CO2 exists in the fire extinguisher.
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