Mass divided by volume. NOTE 1 In the SI system, density is expressed in kilograms per cubic metre (kg/m3); In United States Customary units it is expressed as pounds per gallon (lb/gal) or pounds per cubic foot (lb/ft3). NOTE 2 Drilling fluid density is commonly referred to as “drilling fluid weight” or “mud weight.
Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards
Mass of a substance per unit of volume.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Density is the ratio of the mass to the volume of a product, expressed in terms of kilograms per cubic metre. This applies to liquids, gases and vapours.
Source: Resolution MEPC.119(52), 2004 amendments to the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code), 15 October 2004, International Maritime Organization, Regulatory Guidance