S. G. : (n.) Geology. The dimensionless ratio of the density of a material to that of the same volume of water. Most common minerals have specific gravities between 2 and 7. Alt. form: specific gravity
Schlumberger Ltd. (The World's Leading Supplier Of Technology, Integrated Project Management And Information Solutions to Customers Working in The Oil and Gas Industry Worldwide), Schlumberger Oilfield Glossary Cedex, France 2014. http://www.glossary.oilfield.slb.com/en/Terms/sym/ a.aspx, (Ergo - Brit) {766}