Crookes Radiometer, Handmade Solar Power Glass Windmill with 4 Spinning Vanes Desk Toys for Home Office Decoration Gift, Detecting Sunlight & Science Education (Yellow)

Product Description :

Solar Powered Crookes Radiometer is a great home decoration or holiday gift.
A perfect physics teaching tool too.
Develop children” s intelligence and creativity and arouse children” s desire to explore.
Beautiful design suitable for home, wedding, office, classroom, party etc.
Receiving the love of the sun, turn the windmill, beautiful love!White: represents purity and symbolizes that love has no impurities.
Green: represents youth and symbolizes a positive and energetic state of mind.
Blue: represents eternity, symbolizes piety and honesty.
Yellow: represents yearning and symbolizes the pursuit of goals.
SpecificationMaterial: High Borosilicate GlassCraft: Purely HandmadeSize: 5.
5in X 3inIs this a magic Crookes Radiometer?-Invented in 1873 by the chemist Sir William Crookes as the by-product of some chemical research, the radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum.
-Inside the bulb, on a low friction spindle, is a rotor with several (usually four) vertical lightweight metal vanes spaced equally around the axis.
The vanes are polished or white on one side and black on the other.
-When exposed to sunlight, artificial light, or infrared radiation (even the heat of a hand nearby can be enough), the vanes turn with no apparent motive power, the dark sides retreating from the radiation source and the light sides advancing.
-Just place near a window or under a direct incandescent light as the vanes only rotates in light (sunlight or incandescent light).
The more light shine on the globe the faster the vanes rotates.

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