Crookes Radiometer - animated -500

Radiometer. The Crookes radiometer, also known as the light mill or solar engine, 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. The reason for the rotation has been the cause of much scientific debate.

Author: Nevit Dilmen

via File:Radiometer 9965 Nevit.gif – Wikimedia Commons.

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