Define relative density of a substance. Relative density of silver is 10.8. The density of water is 1000 kg m-3. What is the density of silver in SI units?

It is defined as the ratio of mass to volume.

Now, RD = density of silver/density of water

Therefore, Density of silver = Relative density x Density of water
= 10.8 x 1000 = 10.8 x 103 kg m-3.