: the density of a given amount of particulate matter (such as a powder)
Industry experts say the feather fiber resists wet collapse and has a greater bulk density than conventional wood pulp fiber.—
Baltimore Sun, 30 Jan. 1996
Note:
The bulk density of a substance is determined by dividing the total mass of the substance by the volume that it occupies. Since the mass is in the form of a number of discrete particles, this value can vary depending on how the particles are arranged and therefore is not necessarily dependent on the physical properties of the material.
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Merriam-Webster unabridged
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