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Pewter Nocturnal
Pewter Nocturnal
$39.50
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Radiometer $12.50

Solar energy presents itself as heat and mechanical energy.

Originally designed to show the pressure exerted by light, where light bouncing off the white side of the vane would push it to rotate away from the white side. Instead, the radiometer vanes turn toward the light side and away from the dark side because of heated air. (The heat is generated from the light energy absorbed by the dark side of the vane.)

The original radiometer idea is good, but the reduction of air pressure in the bulb is just not enough to show the effects of light pressure. Instead, it is a great example of the energy carried by light, and how that energy can be converted into heat.

The radiometer is about 5" (12 3/4 cm) in height.

Made of lightweight glass, the radiometer is intended for individuals over 8 years of age.

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