Relative density is given as _________________.
Choose the correct option.

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The ratio of the density of water to the density of the given reference material.

The ratio of the density of given reference material to the density of a substance.

The ratio of the density of a substance to the density of mercury.

The ratio of the density of a substance to the density of given reference material.

answer is A.

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Detailed Solution

The relative density of a substance is given as the ratio of the density of a substance to the density of given reference material.
$Relative density = \frac{Density of the substance}{Density of reference material}$
The relative density of solids and liquids is usually measured with respect to the density of water and the relative density of gases is usually measured with respect to the density of air.
Relative density does not have a unit as it is just a ratio of two densities.