Which of the following is an example of a Class D fuel?

Class D fuels are specifically categorized as combustible metals. These materials can ignite and burn when exposed to flames or high-energy heat sources. Magnesium, being a lightweight metal that can burn fiercely at high temperatures, is a prime example of a Class D fuel.

Understanding this classification is crucial for firefighting efforts, as the methods for extinguishing fires involving Class D fuels differ significantly from those used for other types of fires. For instance, water should never be used on Class D fires because it can react violently with metals like magnesium, potentially exacerbating the situation.

In contrast, propane is classified as a Class B fuel (flammable liquids and gases), wood as a Class A fuel (ordinary combustibles), and electrical wires fall under electrical fire categories rather than Class D. Thus, recognizing the unique characteristics of Class D fires is vital for effective fire prevention and response strategies.