The position of the Gibbs surface
is often defined experimentally as that surface which encloses the volume of space
from which the solid excludes helium gas (the so-called helium dead-space), and is
associated with the assumptions that the volume of the solid is unaffected by the
of component i
, and that helium is not adsorbed by the solid. This requires that the measurement
of the helium dead-space be made at a sufficiently high temperature.
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 595
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