relative-density

relative density

noun Physics.

Origin:
1875–80

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World English Dictionary
relative density
 
n
specific gravity See also vapour density d the ratio of the density of a substance to the density of a standard substance under specified conditions. For liquids and solids the standard is usually water at 4°C or some other specified temperature. For gases the standard is often air or hydrogen at the same temperature and pressure as the substance

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American Heritage
Science Dictionary
relative density  
The ratio of the density of one substance to that of a reference substance, typically water. See more at specific gravity.
The American Heritage® Science Dictionary
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