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Solar-Powered Radiometer - Sold out

Solar-Powered Radiometer - Sold out

Regular price: $14.99
Sale price: $6.99 - You Save 53%

Turn light into energy with Solar-powered Radiometer
Radiometer STEM Toys for 7+ year olds for girls and boys is a glass sphere powered by the sun. Kids will have fun learning about thermodynamics. The vanes, or wings, in the Radiometer are alternately dark and light in color. When the light strikes these wings, it transfers heat to each one, but not to the same degree. The lighter wings reflect the rays and the dark wings absorb the rays. Now when the freely moving particles of air inside the radiometer strike the light-colored reflective vanes, they take on very little energy and do not bounce off very fast. However, when the atoms strike the dark wings, they "kick" away at terrific speed. Result: the vane begins to spin and continue to spin as the bits of air continue to "kick" away from the dark-sided vanes. Naturally, the stronger the light, the more energy there is to "heat" up the dark side of the wings, causing the vanes to spin faster as the light gets brighter. No electricity, no batteries, no power except light. Measures approximately 5" from base to top of glass sphere. Recommended for ages 7 and up. (#9632) A ComputerGear exclusive. Item in stock unless noted above.
Watch a demonstration here!

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