This quantity is constant in incompressible fluids. The ratio between this quantity for a sample and for water is called the specific gravity. Pressure in a fluid is equal to g times height times this quantity according to Pascal's law, and (*) buoyant force is equal to displaced volume times g times this quantity according to Archimedes' principle. For 10 points, name this quantity, symbolized ρ 
This quantity is constant in incompressible fluids. The ratio between this quantity for a sample and for water is called the specific gravity. Pressure in a fluid is equal to g times height times this quantity according to Pascal's law, and (*) buoyant force is equal to displaced volume times g times this quantity according to Archimedes' principle. For 10 points, name this quantity, symbolized ρ [rho], which is the ratio of mass to volume.
This quantity is constant in incompressible fluids. The ratio between this quantity for a sample and for water is called the specific gravity.
(mass) density