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excess volume (at a solid/liquid interface)

Also contains definition of: excess mass (at a solid/liquid interface)

For a pure liquid, despite its low compressibility, the variation of density near a solid surface can be detected and measured. The total volume V of a system consisting of solid and pure liquid is different from (usually less than) that calculated assuming a constant liquid density. If the densities of bulk solid (ρ sol) and liquid (ρ l) are known then an excess volume (usually negative) can be defined as:
V σ = V − V sol − V ° = V − m sol ρ sol − m l ρ l
where m sol is the mass of solid, V sol its volume calculated from the bulk density, V ° is the initial volume of liquid and m l is the mass of liquid. The excess mass is given by:
m σ = m l − ( V − V sol ) ρ l
PAC, 1986, 58, 967 (Reporting data on adsorption from solution at the solid/solution interface (Recommendations 1986)) on page 972
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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