Relative gravity or Specific gravity can be defined as the density ratio of a substance to that of water at a specific temperature . Therefore, Specific gravity tells us if an object will sink or float. Specific gravity is a scalar value that indicates the relationship between the density of a substance and that of water. Calculation formula and examples. Learn the definitions and formulas of density, specific weight, and specific gravity , and how to calculate them for different substances and gases. Find reference values and examples for common materials and compare them with water and air. Calculating Specific Gravity Specific gravity is determined by dividing the density of a material by the density of water at 4 degrees Celsius. For the calculation, the density of the material and that of the water must be expressed in the same units.
