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Line 42: ==Classifications or grades== [[File:Lower 48 U.S. states production of crude oil by API gravity in January 2015 through July 2019 (48880018261).png\|thumb\|upright=1.4\|API gravity of crude oil produced in the [[Contiguous United States]]]] Generally speaking, oil with an API gravity between 40 and 45° commands the highest prices. Above 45°, the molecular chains become shorter and less valuable to refineries.<ref>{{cite web\|title=Comments on Crude Oil Gravity Adjustments \|url=http://dnr.louisiana.gov/sec/execdiv/techasmt/oil_gas/crude_oil_gravity/comments_1989.htm \|archive-url=https://web.archive.org/web/20060502160519/http://dnr.louisiana.gov/sec/execdiv/techasmt/oil_gas/crude_oil_gravity/comments_1989.htm \|url-status=dead \|archive-date=2 May 2006 \|publisher=Louisiana Department of Natural Resources \|~~accessdate~~access-date=6 January 2014 }}</ref> [[Crude oil]] is classified as light, medium, or heavy according to its measured API gravity.

API gravity: Difference between revisions