has part has quality has role dispersion colloid gel 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 1806 gel A gel is a colloid where the continuous phase is a solid and the dispersed phase is a liquid. [Allotrope] solid liquid dispersed phase role continuous phase role portion of material macroscopic scale