Question

How will you relate relative density and density?

Answer 1

1. The relative density of the substance can be defined as the ratio of the density of the substance to the density of the water at 4°C.
Relative density = $\frac{\mathrm{Density}\mathrm{of}\mathrm{substance}}{\mathrm{Density}\mathrm{of}\mathrm{water}\mathrm{at}4°\mathrm{C}}$
2. Since the density of water at 4°C = 1000 kg m^-3
3. We can calculate the actual density of a substance if we know the relative density.
Actual density = Relative density x density of the water at 4°C.

= Relative density x 1000 kg m^-3.
Hence, relative density mainly compares the density of a substance with that of a standard substance and density refers to the closed packing of molecules.