Crookes Radiometer

Discover a piece of scientific history with the Crookes Radiometer, a classic experiment from the 1800s that vividly demonstrates how light converts to heat. This fascinating device, also known as a light mill, offers a captivating visual proof that things can indeed work in a vacuum.

The Crookes Radiometer consists of a glass bulb with a partial vacuum inside, containing a rotor with vanes of differing reflectivity. When exposed to light, the vanes spin due to the differential heating of the surfaces—reflective surfaces absorb less heat and move more slowly, while non-reflective surfaces absorb more heat and move faster. This simple yet profound experiment elegantly illustrates the conversion of light energy into mechanical motion, showcasing fundamental principles of thermodynamics and light.

Perfect for science enthusiasts and educators alike, the Crookes Radiometer provides a striking, hands-on demonstration of how light affects heat and motion, connecting you to a pivotal era in scientific discovery.