Item #81134

Experience this sphere powered by the sun! It spins when sunlight warms the dark vanes and is reflected by the white ones.
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This radiometer is a fun, vivid way to demonstrate heat transfer!

The wings in the radiometer are alternately dark and light. When the light strikes the wings, it transfers heat to each one, but not at the same degree. The light wings reflect the rays and the dark wings absorb the rays. As the light gets brighter it creates more heat and spins the wings faster.

Size: 3.25" x 3.25" x 5.25 (.3 lbs)

Brand Name: American Educational Products

Astronomy Discover