SKU: 43433768887

Radiometer - Impress the In-Laws...Leave it by a Window*

Sale price$11.65 Regular price$12.95
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Ships within 48 hours · Estimated delivery Aug 16 - Aug 21

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Description

Radiometer - Impress the In-Laws...Leave it by a Window*Experience a classic Crookes radiometer for yourself! The metal inside the sealed glass will spin when exposed to strong light. Leave it by a window on a sunny day the stronger the light, the faster it spins! Why does it turn you ask? Well, in case anyone asks, a common myth (one originally held even by the scientist who invented it in 1873, Sir William Crookes) is that the momentum of the absorbed light on the black faces makes the radiometer

Experience a classic Crookes radiometer for yourself!  The metal inside the sealed glass will spin when exposed to strong light.  Leave it by a window on a sunny day...the stronger the light, the faster it spins!

Why does it turn you ask?  Well, in case anyone asks, a common myth (one originally held even by the scientist who invented it in 1873, Sir William Crookes) is that the momentum of the absorbed light on the black faces makes the radiometer operate.  But this can't be right because the white faces move forward (not away from) towards the light source.  Photons of light do exert radiation pressure on the faces, but other effects dwarf these forces. The final explanation it seems depends on having just the right degree of vacuum and is more related to the flow of heat than the direct effect of photons.

For the more adventurous, try out the Precision model.  They are handmade in Germany and are incredibly sensitive, spinning at up to 3,000 rpm in bright sunlight.  With a bit of patience, it will even respond to just the infrared radiation from the heat of your hand!

Recommended for Age 12 & Up (with adult supervision)

*  Especially if you can be nonchalant about it...

 

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SKU: 43433768887

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Elina Nerval
Louisville, US
★★★★★ 5
Soft, Glowing & Hydrated Skin ✨
Size: 11 Fl Oz (Pack of 1)
This body butter is amazing! It keeps my skin soft, smooth, and moisturized all day. The scent is light and beautiful, and it gives my skin a healthy glow without feeling greasy. Perfect for dry skin 😊
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Reviewed in the United States on May 12, 2026
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Syd
Carnegie, US
★★★★★ 5
Wonderful for my super dry skin
Size: 11 Fl Oz (Pack of 1)
This moisturizer is great, I have no complaints. I have VERY dry skin and live in Chicago - where winters only make matters worse. This product has actually healed my dry, cracked skin and improved it's overall condition. It absorbs quickly and the scent is mild. I apply it after exfoliating in the shower at night and when I wake up, my skin is soft and looks healthy.
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Reviewed in the United States on January 25, 2026
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Marcia Acker-Missall
Bozeman, US
★★★★★ 4
Great moisturizer
Size: 11 Fl Oz (Pack of 1)
Very creamy and does nicely as moisturizer on legs arms and especially after shower.
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Reviewed in the United States on May 23, 2026
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Ann Marie Richardson
Birmingham, US
★★★★★ 5
Love it
Size: 11 Fl Oz (Pack of 1)
Leaves my skin feeling amazing!!! Not sticky at all. Just smooth and smells great!
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Reviewed in the United States on May 16, 2026
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MiLadyDre
Alexandria, US
★★★★★ 5
Great product!
Size: 11 Fl Oz (Pack of 1)
I have a hard time finding lotions that actually soak in, most just sit on my face like a film. I love this moisturizer. It penetrates well and smells very good. I also bought the Vasaline RadiantX, which I like a little better because its lighter , its a body cream not butter. But they are both wonderfull
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Reviewed in the United States on April 27, 2026

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