Is aluminum or bronze considered flammable in powdered form?

In powdered form, both aluminum and bronze can present flammable hazards. Powders have a large surface area relative to their volume, which allows them to ignite and burn more easily than their solid counterparts. When fine particles of aluminum are suspended in air, they can readily ignite and potentially cause explosive combustion, especially when exposed to a spark or high temperatures. Similarly, bronze, which is primarily an alloy of copper and tin, can also be flammable under certain conditions when finely divided, although it may not be as readily ignited as aluminum. The important factor is the physical state of these metals; in powder form, they can lead to fire hazards, making it accurate to state that they are considered flammable when dispersed in the air.