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Bulk density is the mass per unit volume measured immediately after filling dust or powder into a container. The relationship between the bulk density ρb of the bed material and the density ρp of the bed material is ρb = ρp (1-ε) ε is the void ratio of the material when it is stationary, ρb is the bulk density, which needs to be measured, and ρp is the true density, which can be consulted in the literature. The packing density of bed materials can be divided into loose packing density and tapped packing density. Among them, the loose packing density includes the average density of the loose particle accumulation in the internal and external pores of the particles and the gaps between the particles. It is calculated by dividing the total mass of the unvibrated granular materials in the natural accumulation state by the total volume of the accumulated materials. The tapped packing density includes the average density of the tapped particle accumulation in the inner and outer pores of the particles and the gaps between the particles (Baidu). The test of packing density is not as easy as everyone thinks. It is related to all aspects of powder materials and even the weather. Although * * There is a national standard for the measurement of bulk density, but most manufacturers measure the bulk density of materials based on their own method, that is, the ratio of mass to volume, which causes all kinds of confusion. The bulk density measured by Factory A is 0.7, but it was sold to Factory B and changed to 0.4. This is an interesting question. Because the measurement conditions of two manufacturers cannot be consistent, but a slight inconsistency will lead to this measurement difference (like the uncertainty principle). The same product crystal shape, crystal particle size, crystal integrity, material stress, and even the speed of loading the material into the measuring container will affect the measurement results. Some laboratories take it for granted that they will weigh a certain amount of materials and use a graduated cylinder to measure the bulk density of the volume. It is actually ridiculous. I am afraid that the results they measure out 10 times will hardly be consistent twice. And the bulk density itself is a range value. What do you use to limit the manufacturer? By the way, it's the solid density. So when you ask about the bulk density of a certain material in the future, don’t ask: A: What is the bulk density of XX? B: 0.1-1.0 C: I want a fixed value D: ￥%#@……