Question

Density of iron 7.8 *10^3 kg/m^3. What is it’s relative density?

Answer 1

Relative density is 7.8
density of iron =relative density of iron ×density of water
density of water is 1000 kg/m³
=7.8×1000
=7800kg/m³

Answer 2

The relative density is same as density of iron