Density and specific gravity are also defined and investigated. Specific gravity is the ratio of the density of a material to the density of water.
Specific gravity is a useful concept when one is comparing materials.
Mass can be determined by weighing the sample on a balance. The volume can be computed from its dimensions. The volume can be measured by determining the volume of the liquid displaced when the sample is immersed. The volume can be determined by the application of Archimedes' Principle. Archimedes' Principle rests on the assumption that the fluid is in static equilibrium.