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 12 - Aug 17

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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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TG88
Charlottesville, US
★★★★★ 3
Fits wide
Color: Navy, Size: 7 Years
Nice suit but fits wide IMO
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Reviewed in the United States on June 5, 2026
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Tracie
Omaha, US
★★★★★ 5
Great material, sharp looking suit!
Size: 7, Color: Light Blue
Very nice suit! We got tons of compliments. Please note it does NOT come with an undershirt. We used this for a First Holy Communion, but I wouldn't hesitate to use it in a wedding! The material was the best that I've seen compared to the four other suits I bought on amazon (I was skeptical and crunched for time)...this won! Great value for the money too. My kid felt very sharply dressed, and wants to find another occasion to wear this light blue suit lol
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Reviewed in the United States on May 17, 2026
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Jaclyn
Lexington, US
★★★★★ 5
Would repurchase
Size: 8, Color: Beige
Perfect for a communion. Would absolutely recommend!
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Reviewed in the United States on May 17, 2026
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Josefrias
Lake Worth, US
★★★★★ 5
Perfect
Size: 7, Color: Light Blue
Love it . Good quality . Value for money . Perfect color . R sizing
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Reviewed in the United States on April 23, 2026
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Elkin Mauricio
Chelsea, US
★★★★★ 5
Calidad en Tela y presentación.
Size: 10, Color: Beige
El Traje divino, tal como la imagen. Solo le quedó un tris grande a mi hijo y listo.
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Reviewed in the United States on April 20, 2026

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