This standard is concerned with the method for the determination of density, relative density (specific gravity) and API gravity of crude petroleum, petroleum, products, or mixtures of petroleum and non-petroleum products normally handled as liquids, and having a Reid vapour pressure of 179 kPa or less. Values are measured on a hydrometer at convenient temperatures, reading of density being reduced to 15oC, and readings of relative density (specific gravity) and API gravity to 15.5oC, by means of standard tables.