Density of iron is 7900 kg ${{m}^{-3}}$. Calculate its relative density. Will it float or sink in water? Give reason for your answer.

(Take, density of water = 1000 kg ${{m}^{-3}}$)

Given, density of iron = 7900 kg ${{m}^{-3}}$

Density of water = 1000 kg ${{m}^{-3}}$

Relative density = Density of Iron / Density of water = 7900 kg ${{m}^{-3}}$ /

1000 kg ${{m}^{-3}}$ = 7.9

As the relative density of an iron object is greater than density of water, so it will sink to bottom.