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A convenient scale of the American Petroleum Institute (API) that is inversely related to the density of liquid petroleum: API gravity = (141.5°/[secific gravity at 16°C]-131.5°). A higher API indicates lighter oil. Fresh water has a gravity of 10° API. Heavy oils have less than 25° API, medium oils have 25 to 35° API, light oils have 35 to 45° API, and condensates have more than 45° API.<ref name=Petersetal_2012>Peters, Kenneth E., David J. Curry, and Marek Kacewicz, 2012, [http://archives.datapages.com/data/specpubs/hedberg4/INTRODUCTION/INTRODUCTION.HTM An overview of basin and petroleum system modeling: Definitions and concepts], ''in'' Peters, Kenneth E., David J. Curry, and Marek Kacewicz, eds., Basin modeling: New horizons in research and applications: [http://store.aapg.org/detail.aspx?id=1106 AAPG Hedberg Series no. 4], p. 1-16.</ref>
A convenient scale of the American Petroleum Institute (API) that is inversely related to the density of liquid petroleum: API [[gravity]] = (141.5°/[secific gravity at 16°C]-131.5°). A higher API indicates lighter oil. Fresh water has a gravity of 10° API. Heavy oils have less than 25° API, medium oils have 25 to 35° API, light oils have 35 to 45° API, and condensates have more than 45° API.<ref name=Petersetal_2012>Peters, Kenneth E., David J. Curry, and Marek Kacewicz, 2012, [http://archives.datapages.com/data/specpubs/hedberg4/INTRODUCTION/INTRODUCTION.HTM An overview of basin and petroleum system modeling: Definitions and concepts], ''in'' Peters, Kenneth E., David J. Curry, and Marek Kacewicz, eds., Basin modeling: New horizons in research and applications: [http://store.aapg.org/detail.aspx?id=1106 AAPG Hedberg Series no. 4], p. 1-16.</ref>
==References==
==References==
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