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 Jul 31 - Aug 5

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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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4.5 ★★★★★
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Verified Purchase
L. Poehlman
Houston, US
★★★★★ 5
Happy pups, happy mama!!!
Flavor Name: Chicken Chips, Size: 1 Pound (Pack of 1)
My pups love these! Great for little dogs!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
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Verified Purchase
V3R€
Dallas, US
★★★★★ 1
Dnt buy!!
Flavor Name: Chicken Chips, Size: 1 Pound (Pack of 1)
These Suck! I have 3 Shih Tzus the one that ate it had a hard time chewing it and the other 2 couldn’t even I had to stick my finger down their mouth cuz they were choking and were trying to spit it out these are not chips they’re more like hard jello the texture is terrible even the color was weird the quality of this product sucks
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2025
A
Verified Purchase
Amazon Customer
Boise, US
★★★★★ 5
My picky dog loves them.
Size: 3.5 Ounce (Pack of 2), Style: Chicken Chips, Size: 3.5 Ounce (Pack of 2), Style: Chicken Chips
I try to give my dog, whom I love so much, the healthies food and treats that i can. She is so very picky and it's difficult to find things she likes. She loves these treats and expectes one every morning. She litterally waites by the pantry door for one. The are healthy Human grate chicken chips. Makes me feel better about giving her a treat. I would Highly recommend.
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Reviewed in the United States on May 13, 2026
E
Verified Purchase
E J W
Alexandria, US
★★★★★ 5
Treats
Size: 3.5 Ounce (Pack of 1), Style: Chicken Chips
Puppy likes them
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Reviewed in the United States on April 21, 2026
B
Verified Purchase
Beatrice Antunes
Fort Morgan, US
★★★★★ 5
my dog is obsessed with these
Size: 3.5 Ounce (Pack of 1), Style: Chicken Chips
my senior lhasa apso loves these. he smells them and takes it with happiness and excitement! he loves these, can't get enough.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026

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