Explain density and relative density and write formulae.

Density is the measure of mass per volume. This means that density of any solid,liquid, or gas can be found by dividing its mass in kilogram by its volume in cubic metres.

the unit for density is Kg per metre cube. It can be expressed in g/cm³(ml)

Relative density→ it is ratio of a density of the substance to the density of the given reference material. Lets assume our reference material is water then density relative to water will be -

Relative density is a ratio, it’s a dimensionless quantity.