Answer :
Final answer:
Class B fire extinguishers are used for fires involving flammable liquids and gases. This is based on the classification of fire extinguishers, where each class is designed to handle specific types of fires.
Explanation:
The class of fire extinguishers used for fires involving flammable liquids and gases is Class B. Fire extinguishers are classified based on the types of fires they can extinguish. Class A is used for ordinary combustibles like wood and paper, Class B for flammable liquids and gases, Class C for electrical fires, and Class D for flammable metals. The mention of flammability as a chemical property along with reference of waste liquids with flash points below 60 °C, such as used solvents and waste oils, all point towards the use of Class B fire extinguishers for these types of fires.
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