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Publish On: 2018-12-08

Guy white

Total Post: 819

Question: Describe specific gravity or relative density

Reply On: 2014-01-07

lala singh

Total Post: 22

ANS: Describe specific gravity or relative density

The specific gravity, or relative density, of a substance is the ratio of its density to that of some standard substance. The standard usually chosen in water at the temperature of its maximum density, 4°C. Thus, if ρ is the density of the substance and ρω of the substance is
                                         




Since each of the two densities has the same unit, their quotient is dimensionless and has no unit. Relative density is often more convenient to tabulate than density, the values of which are different in the various system of units.
                                   


The units of density thus obtained will be those of the system in which the density of water is expresses.

Since the density of water in the cgs system is 1 g/cm3, densities in that system are numerically equal to the relative density.

 

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