Crookes radiometer

Crookes radiometer

noun Optics.
radiometer ( def 1 ).

Origin:
1880–85; after Sir W. Crookes

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Crookes radiometer
 
n
physics a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side. The vanes are mounted on a vertical axis and revolve when light, or other radiant energy, falls on them

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