Modern Chemistry, Lesson 155: Colloids

Duration: 30 min

Creator: Encyclopaedia Britannica Educational Corporation

Description: Discusses various types of colloidal systems, including sols, emulsions, gels, and aerosols. The viewer is given the problem of calculating the tremendous increase in surface when a cube, one centimeter on an edge, is cut a million times in each of the three dimensions, giving particles of colloidal size. As a demonstration of a large surface, foam is prepared and used to smother an organic chemical fire which is not extinquished by water.

Metadata Source:Catalog of Classroom Teaching Films for Georgia Schools, No. 10 (Georgia Department of Education)