ISO 3838:2004

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Crude petroleum and liquid or solid petroleum products — Determination of density or relative density — Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods

ISO 3838:2004 is an international standard that outlines methods for determining the density or relative density of crude petroleum and liquid or solid petroleum products using either a capillary-stoppered pyknometer or a graduated bicapillary pyknometer, essentially providing a standardized way to measure the density of these substances in a laboratory setting