Glazed porcelain evaporating basins that can be used as evaporating basins when studying changing states of matter. It has a round bottom with spout. The size of basin is a 10.4cm rim diameter. Supplied in a set of 10. An evaporating dish is commonly used for the evaporation of solutions liquids, and sometimes to their melting point. They are used to evaporate excess solvents so that you are left with a concentrated solution or solid.