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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The important point is the relative density of the air.
Shrub canopy cover and density by species were converted to relative cover and relative density.
Relative density index is one measurement used to quantify the densities of forest stands.
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