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Density = mass / volume

It represents the amount of matter in a given volume

Relative density (specific gravity) compares the density to that of water, which is 1 gram per cubic centimetre.

Say iron @ 7.85 grams / cu cm would pack 7.85 times the matter into the same space.
In physics and materials science the density (ρ) of a body is a measure of how tightly the matter within it is packed together, and is given by the ratio of its mass (m) to its volume (V). Its SI units are kilograms per cubic metre (kg/m3). It is also sometimes given in the cgs units of grams per cubic centimetre (g/cm3). Density is defined as: (ρ) rho = m / V Different materials usually have different densities, so density is an important concept regarding buoyancy, metal purity and packaging.

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What is the most common unit for density?

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