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RVFM Crookes Radiometer

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Brand: RVFM  MPN: EDU094 
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The Crookes Radiometer from RVFM demonstrates the conversion of radiant energy into mechanical energy.
  • Consists of a partly evacuated glass bulb approximately 70mm diameter with a fine pivot on which a rotor, having a set of four mica vanes, is delicately balanced
  • Each vane has one side painted matt black with other side bright
  • On exposure to sunlight, or a sufficiently bright incandescent light source, the vanes turn
  • The absorption of radiant energy by the blackened side of the vanes sets up a temperature differential with respect to the bright sides, causing net force to be exerted by the air molecules on the blackened side which makes the vanes rotate with their bright faces leading
  • Mounted on a base for stability
  • Suitable for Key Stages 3 & 4 (ages 11 to 16)


Reviewed by: Natalie Winter - 24 June 2009
I havent seen these around for years! This one is good value as well as being a great educational toy I was surprised to find out how many science graduates couldnt correctly explain why it works!