The storing, handling, and processing of bulk solid materials is fundamental to nearly every manufacturing and processing industry, from the food industry and agribusiness, to the plastics industry, to the mining and cement industries, to coal-fired electric utilities. This concise introduction to the use of radar for measuring solid materials in solution or in dispersion provides useful applications for industrial processing and manufacturing. It is a boon to industrial engineers, controls engineers, and manufacturing technicians who want to quickly learn about the great potential for automating processes heretofore considered too difficult by using radar-based sensing for solids measurement.