20.5cm Glass Windmill Solar Powered Crookes Radiometer Light Mill/Educational Teaching Study Tool/Office Home Decoration Light Pressure Windmill Crookes Crokes Car Ornaments Sunshine

Size: 120mm, dial diameter 75mm, base diameter 62mm Material: Glass Color: Transparent Package contents: 1 x Radiometer Height: 205mm Ball diameter: 90mm Base diameter: 80mm The whole is made of glass and the interior is close to vacuum. It can be rotated by light, and it can be rotated in the opposite direction by cold wind Principle: When the light is illuminated, the black leaf surface absorbs heat energy, and the white leaf surface releases heat energy, which can push the four leaf surfaces to rotate. Only the above package content, other products are not included. : light reflection and different screen can make the color element of the picture a different from the real object. The allowed measurement is +/- 1-3 cm.

• The fins are polished or white on one side and black on the other. When exposed to sunlight, artificial light or infrared radiation (even the heat from a nearby hand can be enough), the fins rotate without apparent driving force, the dark sides remove from the source of radiation and the sides of the light moving forward.
• Subject: Physical; Inside the bulb, on a low coefficient of friction, finds a rotor with several (usually four) vertical light metal fins spaced equally around the axis.
• The beautiful glass radiometer makes a great gift for anyone who has everything.
• Simply place it near a window or under direct incandescent light, the car blades only rotate under the effect of light (sunlight or incandescent). The light shines on the globe, the dawn turns quickly.
• All made of glass. This physical and technical miracle clearly shows you how sunlight is converted into energy. Place near a window or under incandescent light and observe the rotation of the flights.