/ Dictionary / Index S specific gravity: Meaning and Definition of Find definitions for: specif'ic grav'ity Pronunciation: [key] — Physics. Physics. the ratio of the density of any substance to the density of some other substance taken as standard, water being the standard for liquids and solids, and hydrogen or air being the standard for gases. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. specific conductance specific heat Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language