- The interrelations between density, mass, volume, and specific gravity for a liquid or solid,
- Putting it another way, know the two interrelations that can get you to the density of a solid or liquid (ρ(SG) and ρ(m,V)).

Explanation: There is a relationship between the density of a solid or liquid to its specific gravity and the density of a reference state. There is also a relationship between the density of a solid or liquid with its mass and volume.
Specific Gravity (SG) is a ratio of densties, the density (ρ) of a specific substance and of a reference and is therefore unitless. _{i} = ρ_{i} / ρ_{ref}because water is usually the reference, you get _{i} = ρ_{i} / ρ_{H2O}, or ρ_{i} = SG_{i} * ρ_{H2O}and when 1 g/mL is the density of water, which is usually an acceptable approximation at moderate temperatures and pressures, so you will usually use the following equation to calculate the density of substance knowing its specific gravity: ρ_{i} = SG_{i} * 1 g/mLIf the problem statement gives the density of water to be anything other that 1 g/mL (for example, .98 g/mL), use that density in place of 1 g/mL in the above equation (ρ
The relationship for the density of a solid or liquid given its mass and volume is the following: density = mass / volume, or ρ = m / V
The specific gravity of gasoline is approximately 0.70. Determine the mass (kg) of 50.0 liters of gasoline.
Calculate densities in lb - a liquid with density of 995 kg/m
^{3}. - a solid with a specific gravity of 5.7.
Calculate the density of mercury in lb |

© 2007 Arizona Board of Regents for The University of Arizona |