of a solid material (a precipitate) from a liquid solution in
which the material is present in amounts greater than its solubility
in the liquid.
occurs in sol
aggregated to a size where gravitational forces cause them to sink or float.
Generally, aggregation arises from a change in the sol
that reduces the interparticle repulsion.
PAC, 2007, 79, 1801
(Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007))
on page 1824
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