What are some examples of flammable solids?

The identification of flammable solids is key in understanding hazardous materials. Flammable solids are substances that can ignite and burn readily under normal conditions. In the context of the correct answer, magnesium, aluminum powder, zinc, and sodium are all materials that present flammable characteristics due to their chemical properties.

Magnesium is particularly known for its ability to burn rapidly when ignited, producing an intense flame. Aluminum powder can also burn and may even be used in pyrotechnics due to its reactivity. Zinc, while not as commonly recognized for flammability, can still be a fire hazard when in powder form. Sodium, on the other hand, is highly reactive with water and can ignite spontaneously in air, making it a highly dangerous flammable solid.

The other options include materials that do not qualify as flammable solids in the same manner. For instance, wood, coal, rubber, and plastic can certainly catch fire, but they usually fall under the category of combustible materials and may require specific conditions for ignition. Glass, metal, stone, and marble do not burn at all, and while they may be involved in fires, they do not ignite. Paper, cardboard, fabric, and leather are indeed flammable, but they serve as more traditional