Relative density

Relative density is the ratio of the densities of two materials. The term specific gravity is similar but not the same. In specific gravity, the reference material is water. Mathematically, relative density is found with:

[math]\displaystyle{ G = \frac{\rho_\mathrm{object}}{\rho_\mathrm{reference}}\, }[/math]

Relative Density Media

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  A United States Navy Aviation boatswain's mate tests the specific gravity of JP-5 fuel

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  An empty glass pycnometer and stopper

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  A full pycnometer, photographed on 5 mm squares.

Other websites

• Weight Per Cubic Foot And Specific Gravity Archived 2006-05-22 at the Wayback Machine