Which factor can vary in relation to fire extinguisher types?

The effectiveness of a fire extinguisher and its intended fire classes are fundamental characteristics that distinguish various types of extinguishers. Different extinguishers are designed to combat specific types of fires, categorized by the materials involved. For example, Class A extinguishers are suitable for ordinary combustibles like wood and paper, while Class B extinguishers are effective against flammable liquids, and Class C extinguishers are tailored for electrical fires.

This differentiation ensures that each extinguisher is optimized for specific fire scenarios, maximizing its effectiveness in those situations. Thus, understanding the relationship between the type of fire extinguisher and the intended fire classes is crucial for selecting the appropriate extinguisher for any given emergency.