If in powdered form, aluminum and bronze are flammable.

If in powdered form, aluminum and bronze are flammable.

• A. Only bronze
• B. True
• C. Only aluminum
• D. False

Answer: (B)

Metal powders burn much more readily than the solid metal because tiny particles have a lot of surface area exposed to oxygen, so oxidation happens quickly and can propagate through a dispersed cloud of dust. Aluminum powder is a well-known flammable dust and can ignite and burn vigorously when suspended in air. Bronze, while less common, also becomes flammable when finely divided; copper-tin particles can oxidize rapidly in dust form and ignite if there’s an ignition source. So the statement is true: in powdered form, both aluminum and bronze are flammable.

Metal powders burn much more readily than the solid metal because tiny particles have a lot of surface area exposed to oxygen, so oxidation happens quickly and can propagate through a dispersed cloud of dust. Aluminum powder is a well-known flammable dust and can ignite and burn vigorously when suspended in air. Bronze, while less common, also becomes flammable when finely divided; copper-tin particles can oxidize rapidly in dust form and ignite if there’s an ignition source. So the statement is true: in powdered form, both aluminum and bronze are flammable.