To determine the percent solids (or solids fraction) of a slurry from the density of the slurry, solids and liquid
where
: is the solids fraction of the slurry (state by mass)
: is the solids density
: is the slurry density
: is the liquid density
In aqueous slurries, as is common in mineral processing, the specific gravity of the species is typically used, and since specific gravity of water is taken to be 1, this relation is typically written:
even though specific gravity with units tonnes/m (t/m) is used instead of the SI density unit, kg/m.