Question

If the density of water is 1 g cm–3 , then density of water in s.I. System is

Answer 1

$density = \frac{1gm}{1 {cm}^{3} }$
Have to change it in SI unit then-

First change mass in Kg then volume in cubicmetres.

$1kg = 1000gm \\ 1gm = {10}^{ - 3} kg \\ \\ 1 {m}^{3} = {10}^{6} {cm}^{3} \\ 1 {cm}^{3} = {10}^{ - 6} {m}^{3}$
Now

Density in SI units will be–

$density = \frac{ {10}^{ - 3} }{ {10}^{ - 6} } \\ = {10}^{3} \frac{kg}{ {m}^{3} }$

Hope it will help you!!