The commercial specification ranges of some products may place their densities partly within an adjacent class (for example, a low density diesel may lie in the jet fuel class). Note the product descriptors are generalizations. ![]() 4.7 Refined Products-A refined product is considered to conform to the commodity group of Generalized Refined Products if the fluid falls within one of the refined product groups. ![]() The user should refer to the appropriate sections of API MPMS Chapter 9 or other appropriate density/hydrometer standards for guidance. However, detailed procedures to correct a glass hydrometer reading are beyond the scope of API MPMS Chapter 11.1–2004/Adjunct to IP 200/04/Adjunct to ASTM D1250–04 (ADJD1250-E-PDF). ![]() ![]() The 1980 CTL Tables had generalized equations to correct glass hydrometer readings, and these corrections were part of the printed odd-numbered tables. 4.4 When a glass hydrometer is used to measure the density of a liquid, special corrections must be made to account for the thermal expansion of the glass when the temperature is different from that at which the hydrometer was calibrated.
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