Answer :
Final answer:
Class B fire extinguishers should be used for fires caused by flammable liquids such as gasoline. They use substances like CO2 to smother and cool down the fire. Performance can be affected by external conditions such as temperature.
Explanation:
Given your question, it can be determined that class B fire extinguishers should be used to extinguish fires involving flammable liquids. This class of extinguishers are designed to handle fires arising due to the combustion of materials such as gasoline, grease, or oil. They utilize substances like CO2 and specific chemicals which smother the fire, depriving it of oxygen, and thereby cooling and extinguishing it.
It is also important to note that the external conditions can affect the performance of these extinguishers. For instance, if the temperature is above the critical temperature of CO2, which is 31°C or 304 K, no amount of pressure can liquefy CO2. This means that on a hot day, no liquid CO2 would exist in the fire extinguisher.
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