Density ratio between an object and a fluid $ \text{Specific Gravity}, SG= \frac{\rho_\text{object}}{\rho_\text{water}} $ $ \rho_\text{water}=1000\,\text{kg\,m}^{-3} $ Object with $SG\lt1$ floats, sinks otherwise Denotes fraction of a floating objecting submerged underwater - an object made of a material with a specific gravity of 0.2 will have 20% of its volume underwater