Crookes Radiometer, 2.75" (70mm) Diameter, on Plastic Base

The Eisco Labs Crook’s Radiometer features an evacuated glass bulb with black and white vanes mounted on a sturdy plastic base. The bulb measures 2.75" (70mm) in diameter. When exposed to light, the vanes spin due to differential heating of the black and white surfaces. This classic physics demonstration illustrates the relationship between light, heat, and mechanical motion. Suitable for physics classrooms studying thermal radiation, photon momentum, and energy conversion.