density
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kg/m^3 (kilograms per cubic meter)
S.I. unit for length : meter S.I. unit for mass : Kilogram Thus: S.I. unit for volume : cubic meter ( m3 ) S.I. unit for density : Kilograms per cubic meter ( kg/m3 )
Modern hydrometers usually measure specific gravity which is usually expressed by a unit of mass per a unit of volume, like kilogram per cubic meter or gram per milliliter.
MPa (Megapascal) is a unit of pressure, while kg/m^3 (kilograms per cubic meter) is a unit of density. They measure different physical properties and cannot be directly converted from one to the other.
The SI unit of density is kilograms per cubic meter (kg/m^3).