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==Using API gravity to calculate barrels of crude oil per metric ton==
In the oil industry, quantities of crude oil are often measured in metric [[tonne|ton]]s. One can calculate the approximate number of [[
:<math>\text{barrels of crude oil per metric ton} = \frac{\text{API gravity}+131.5}{141.5\times 0.159}</math>
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:<math>\mbox{SG oil} = \frac{\rho_\text{crudeoil}}{\rho_{\text{H}_2\text{O}}}</math>
With the formula presented in the previous section, the API gravity can be readily calculated. When converting oil density to specific gravity using the above definition, it is important to use the correct density of water, according to the standard conditions used when the measurement was made. The official density of water at 60 °F according to the 2008 edition of ASTM D1250 is 999.016 kg/m<sup>3</sup>.<ref>Report on the Development, Construction, Calculation and Preparation of the ASTM – IP Petroleum Measurement Tables (ASTM D1250; IP 200), 1960, published by the Institute of Petroleum, 61 New Cavendish Street, London, W.1 and American Society for Testing Materials, 1916 Race Street, Philadelphia 3, Pa.</ref> The 1980 value is 999.012 kg/m<sup>3</sup>.<ref>API Manual of Petroleum Measurement Standards, Chapter 11.1 – 1980, Volume XI/XII, Adjunct to: ASTM D1250-80 and IP 200/80</ref> In some cases the standard conditions may be 15 °C (59 °F) and not 60 °F (15.56 °C), in which case a different value for the water density would be appropriate (''see'' [[standard conditions for temperature and pressure]]).
==Direct measurement of API gravity (hydrometer method)==
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