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Bulk density of some material is its total mass divided by its total volume, as opposed to the density of portions of the material, which may have higher and lower densities. Bulk density is used in comparisons of planets, planetoids, meteoroids, etc., as a first approximation of similarity.
The term bulk density is also used in soil science, such as for particulate material (that includes voids), counting the void volumes as part of the total volume.