## Wikipedia - Specific surface area (en) Wikipedia - مساحة السطح الخاصة (ar) specific surface area

in surface chemistry
https://doi.org/10.1351/goldbook.S05806
When the area of the @I03082@ between two phases is proportional to the mass of one of the phases (e.g. for a solid @A00153@, for an @E02065@ or for an @A00176@ ), the specific surface area ($$a$$,$$s$$ or preferably $$a_{s}$$) is defined as the surface area divided by the mass of the relevant phase.
Sources:
Green Book, 2nd ed., p. 63 [Terms] [Book]
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 583 [Terms] [Paper]