Definition and classification of colloids by International Union of Pure and Applied Chemistry
= Definition and classification of colloids by International Union of Pure and Applied Chemistry
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https://list.iupac.org/reports/2001/colloid_2001/manual_of_s_and_t/node33.html
The official terminology section defines the <colloidal> range as roughly $1\,\mathrm{nm}$ to $1\,\mathrm{\mu m}$ in at least one dimension and classifies systems by dispersed and continuous constituents.