specific volume

Wiktionary

1. n. physics The volume of unit mass of a substance; the reciprocal of its density

GNU Webster's 1913

1. n. (Physics & Chem.) the quotient obtained by dividing unity by the specific gravity; the reciprocal of the specific gravity. It is equal (when the specific gravity is referred to water at 4° C. as a standard) to the number of cubic centimeters occupied by one gram of the substance.