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    http://qudt.org/vocab/quantitykind/RelativeMassDensity

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    lang:en
    Relative Mass Density
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    http://en.wikipedia.org/wiki/Relative_density
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    http://www.iso.org/iso/catalogue_detail?csnumber=31889
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    \(d = \frac{\rho}{\rho_0}\), where \(\rho\) is mass density of a substance and \(\rho_0\) is the mass density of a reference substance under conditions that should be specified for both substances.
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    Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material.