$12.25 - plus shipping
Sun-powered sphere tells the weather!
The fascinating sun-powered vanes tell the weather for you!
Displaying a basic principle of science, the vanes in the Radiometer are alternately dark and light in color. When the light strikes these vanes it transfers heat to each one - but not at the same degree. The lighter vane reflects the rays and the darker vane absorbs the rays. The stronger the light, the more energy there is causing the vanes to spin faster. For ages 8+.
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