Relative Density
The density of a substance is defined as mass per unit volume.
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.
Relative density has no units. Density of a substance is one of its characteristic property and is different for different substances.
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