what is the specific weight of water
The SI unit for the specific weight is N/m 3 while the English unit is lb/ft 3. Specific gravity is simply the ratio of the specific weight of a given liquid to the specific weight of water at 4Â° C (Î³ water = 9.81 kN/m 3 or 62.4 lb/ft 3). This definition is helpful when comparing densities of different liquids.