Here is a great in-class activity from The NEED Project (also linked from the Department of Energy’s website).  The activity, called “Colors and Light” teaches students about the ability of color to absorb light.  It requires four clear glasses, water, food coloring, and a thermometer and shouldn’t take more than 20 minutes.

For more information about The NEED (National Energy Education Development) Project, click here.

For directions on how to perform the Colors and Light activity, click here.