EntityQ29246· pop 21· linked from 150 articlesAPI gravitySign in to savemeasure of how heavy or light a petroleum liquid is compared to waterConnectionspetroleumEntitystandard temperature and pressureEntityheavy crude oilEntityInternational Standard Book NumberEntitymass densityEntityWayback MachineEntitydigital object identifierEntitytonneEntityviscosityEntitysalinityEntitybuoyancyEntitybitumenEntityhydrometerEntitybarrelEntityUnited States Geological SurveyEntitycontiguous United StatesEntitydimensionless quantityEntityNational Institute of Standards and TechnologyEntityvolatile organic compoundEntityoil sandsEntityCategoriesAmerican Petroleum InstitutePetroleum geologyPetroleum productionPhysical quantitiesUnits of density