Misc. DIY homemade Crooke's radiometer?

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The discussion centers around creating a homemade radiometer, with participants sharing their experiences and project ideas. One user is constructing a radiometer inside a mason jar, utilizing a food saver jar-adapter to create a vacuum. Others emphasize the importance of achieving good seals and a low vacuum, noting that smaller vessels yield better results. There is a mention of a movie suggesting that a high vacuum may not be essential for the radiometer's function, which prompts curiosity about the minimum vacuum required for effective operation. Participants express interest in updates on the project and the results, highlighting the balance between friction and molecular density in achieving optimal performance. The conversation also touches on the challenges of measuring pressure within the system and the complexities of vacuum creation.
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Is there any way to make one at home?
 
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AdrianMachin said:
Is there any way to make one at home?
What have you found in your Google searching so far?
 
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berkeman said:
What have you found in your Google searching so far?
Found some cool projects, but was looking for a way to make it like those inside a light bulb.
 
Baken said:
https://www.instagram.com/p/BR3acncFNVK/ I'm building it in a mason jar and will pump the air out with a food saver jar-adapter.
Good luck with it. You will need to make some pretty good seals and getting the vacuum very low will take some ingenuity. The smaller that your vacuum vessel is, the lower vacuum you will achieve so don't use a large jar.
 
Cool. Also want to see the results. So, if you can, give us links or smth. :wink:
 
Baken said:
pump the air out with a food saver jar-adapter.
From that movie, it seems that a high vacuum is not necessary. which is interesting. A 'Proper' radiometer that works by photon momentum needs high vacuum (to avoid the effect of bouncing molecules in the cheap method).
I always find it amazing that it's possible for me to go through life making totally wrong assumptions of 'amounts' when such things are constantly on my (in particular) mind. I must try to make one as well and see just how little vacuum is needed. There will be an optimum compromise between friction and density of fast molecules, I guess. Have you managed to measure the pressure in there? An 'optimistic' estimate can be made, using the 'compression ratio' of the system - pump volume vs vessel volume which ignores leaks etc.
 
To OP, how's the result of your project? I just realized this post is 2 years old.
 

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