What is a common function of fire extinguishers?

The primary function of fire extinguishers is to smother flames. This is typically achieved by displacing oxygen, which is one of the essential elements for combustion. When an extinguisher is used—particularly those containing foam, dry chemical agents, or CO2—it effectively blankets the fire, cutting off its oxygen supply and putting it out. This method is crucial in controlling fire spread and minimizing damage or risk to life. Each type of extinguisher is designed to address specific classes of fire, emphasizing the importance of using the appropriate agent to effectively smother the flames.