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Because of its relatively large surface area, dust is more flammable than solid objects. When high concentrations of very fine powders are suspended in air, they have a tendency to violently, unexpectedly combust, even in the absence of a flame. Materials that cause dust explosions include not only coal and sawdust but also flour, sugar, and even powdered milk. Deadly dust explosions have gutted mines and leveled silos and factories. What methods are used in industry to prevent dust explosions?
Source: The Free Dictionary