Requires addition of a precipitating agent to the sample solution.
Upon addition of the first drops of the precipitating agent, supersaturation occurs,
then nucleation starts to occur where every few molecules of precipitate aggregate
together forming a nucleous.
At this point, addition of extra precipitating agent will either form new nuclei or will
build up on existing nuclei to give a precipitate.
This can be predicted by Von Weimarn ratio where, according to this relation the
particle size is inversely proportional to a quantity called the relative supersaturation
where