Define weight density and relative density and give its unit.
i. Weight Density: It is the weight per unit volume. OR It is the ratio of weight to the volume
Unit: N/m3 or kN/m3
ii. Relative Density: It is the ratio of specific weight of liquid to the specific weight of pure water at 40 C. OR It is the ratio of density of liquid to the density of pure water at 40 C.
Unit: No unit.