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Powder refers to materials that exist in a fine powder particle state under normal conditions. Specifically, the powder is an aggregate composed of a large number of solid particles and their interspaces, such as flour, soybean milk powder, milk powder, coffee powder, Rice noodles, wheat powder, soybean powder, and salt in food; River sand, soil, dust, and sandstorms in nature; Industrial products such as gunpowder, cement, pigments, pharmaceuticals, fertilizers, etc. all belong to powders. Their common feature is that they have a large specific surface area, are composed of many particles of different sizes, and there are gaps between particles.