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surface pressure

The change of interfacial tension caused by addition of a given species to a base solution. When an area of liquid covered with a spread substance is separated from a clean area of surface by a mechanical barrier, the force acting on unit length of the barrier is called the surface pressure, π or π s, and is equal to γ 0 − γ where γ 0 is the surface tension of the clean surface and γ that of the covered surface.
Source:
PAC, 1972, 31, 49 (Extended chain crystals of linear high polymers) on page 59
PAC, 1983, 55, 1251 (Interphases in systems of conducting phases (Provisional)) on page 1264
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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: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.S06185.
Original PDF version: http://www.iupac.org/goldbook/S06185.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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