Crookes Radiometer or Light Mill has 4 vanes suspended on a frictionless spindle inside a glass bulb with vacuum. When exposed to a light source the photons collide with the black side of the vanes causing the vanes to rotate photons that collide with the silver side of the vanes are reflected away which means the vanes only rotate in one direction hence the nickname Light Mill. | Queensland Weather Watch | Facebook

The Crookes Radiometer is a classic piece of vintage science equipment and a fun, visual learning tool. It also happens to be a beautiful decorative piece, and adds a touch of elegance to any setting. Its basic form is a glass bulb with a base; inside the bulb is a frictionless vertical shaft with four delicate diamond-shaped vanes, each with a dark side and a light side. When light shines on the vanes they move, turning the shaft (some versions can spin up to 1000 revolutions a minute). The cau

26K views · 299 reactions | Radiometer: this classic physics toy came...