API Gravity 03 : An arbitrary scale to conveniently express the gravity or density of liquid petroleum products. The scale is derived from "specific gravity" according to the following equation: 141.5
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}