These radiation cans are useful for demonstrating solar energy and heat transfer. Just add water and a thermometer to each of the 3 cans, place in the sun or near a bright light bulb, and watch the temperatures rise. The cans are finished with silver, black, and white exteriors so students can easily determine the effect of surface color on energy transfer. Each can measures 2.5" x 9" and holds 500mL of water. Comes with a Teacher’s Guide.