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What Is The Metric Unit For Density?

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Assuming density as being mass per unit of volume,

the International System (SI) unit (which adopts the metric system) for it would be:

Kg / m^3 (Kilogram per cubic meter)

Most of the common units though refer to 1000 times less the SI unit such as:
Kg/L
g/mL

Density can also be used as relative density, in such case it is dimensionless. It is represented as a fraction between the absolute density and the density of some standard (usually water)

Due to the water density being 1Kg/L, relative density will most of the times show the exact same numerical value but without any units.

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