Relative Density
The density of a substance is defined as mass per unit volume.
Relative Density $=\frac{\text { Mass }}{\text { Volume }}$
S.I. unit of density is kg/m3
The relative density of a substance is the ratio of its density to that of water
Relative Density $=\frac{\text { Density of substance }}{\text { Density of water at 4ºC }}$
Relative density of a substance $=\frac{\text { Mass of the substance }}{\text { Volume of the substance }} \times \frac{\text { Volume of water }}{\text { Mass of water }}$
If we take equal volumes of water and substance then
Relative Density of substance $=\frac{\text { Mass of substance }}{\text { Mass of water }}$
The relative density of a substance expresses the heaviness or density of the substance in comparison to water.
For Example : Relative density of iron is 7.8 means iron is 7.8 times heavy as an equal volume of water.
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