A dispersion in which a large proportion of gas by volume in the form of gas bubbles,
is dispersed in a liquid, solid or gel
. The diameter of the bubbles is usually larger than
, but the thickness of the lamellae between the bubbles is often in the usual colloidal
size range. The term froth has been used interchangeably with foam. In particular
cases froth may be distinguished from foam by the fact that the former is stabilized
by solid particles (as in froth flotation
q.v.) and the latter by soluble substances.
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 606
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. https://doi.org/10.1351/goldbook