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May 15 2012

knowledgeiscake:

Weird Things I Think Are Cool- Crookes Radiometers

The Crookes radiometer, also known as the light mill, consists of an airtight glass bulb, containing a partial vacuum. Inside are a set of vanes which are mounted on a spindle. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity. The reason for the rotation has historically been a cause of much scientific debate.

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  8. nadiasmith reblogged this from knowledgeiscake and added:
    i have one of those in my windowsill
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    The Crookes radiometer, also known as the light mill, consists of an airtight glass bulb, containing a partial vacuum....
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  25. chemicalcourage reblogged this from knowledgeiscake and added:
    Reminds me of home. Dad loves his.
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  31. smallnightbird reblogged this from big-endian and added:
    I’ve had one of these on my windowcill since I was very small. :3
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