RELATIVE DENSITY

As you know, the density of a substance is
defined as mass of a unit volume. The unit of
density is kilogram per metre cube (kg m–3).
The density of a given substance, under
specified conditions, remains the same.
Therefore the density of a substance is one
of its characteristic properties. It is different
for different substances. For example, the
density of gold is 19300 kg m-3 while that of
water is 1000 kg m-3. The density of a given
sample of a substance can help us to
determine its purity.
It is often convenient to express density
of a substance in comparison with that of
water. The relative density of a substance is
the ratio of its density to that of water:
Density of a substance
Relativedensity =
Density of water