"specific gravity." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/specific-gravity>.
specific gravity. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/specific-gravity
The ratio of the mass of a solid or liquid to the mass of an equal volume of distilled water at 4°C (39°F) or of a gas to an equal volume of air or hydrogen under prescribed conditions of temperature and pressure. Also called relative density .