Question

what is relative density?
write the si unit of density

Answer 1

Relative density is the ratio of density of a substance to the density of water at 40 C .Since the units for both the numerator and denominator are same, they cancel each other. Thus relative density has no units. Density is defined as mass per unit volume. Hence its SI unit is: kg/m3.

Answer 2

Explanation:

1)Relative Density. Relative Density. The relative density of a substance is the ratio of its density to that of water. Relative density is a ratio so it has no unit.

OR IN ANOTHER WAY

Relative density is a ratio of the densities of two materials. The term specific gravity is similar but not same. In specific gravity, the reference material is water. If a substance's relative density is less than one then it is less dense than the reference; if greater than 1 then it is denser than the reference.

2)Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth's density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in metre-kilogram-second or SI units).

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