Radiometer/Solar Windmill-Transparent and Large

The light energy radiometer, originally called Radiometer, is an educational physical device that can fully demonstrate how to convert light energy into kinetic energy. It is composed of a glass ball and a set of 4 mica blades mounted on a needle. When the light shines on the mica blades, These 4 mica sheets will start to rotate, the stronger the light, the faster it rotates, the weaker the light, the slower it rotates, or even stand still. The radiometer does not need to rely on any battery or plug in. It only needs to be placed under a bulb or in the sun. After the blades absorb enough light and heat energy, the blades inside the glass will slowly start to rotate~ Elegant curved appearance, transparent and clear glass craftsmanship, it is very pleasing to the eyes when decorating at home or office, let the sun shine into your heart, and rotate with the windmill blades, there are four styles: pure and natural transparent color, maltose The amber, the green of the turquoise grass and the blue of the azure ocean are for your choice! ♦Principle of photoradiometer: Also known as Crooks radiometer was invented by British physicist and chemist Crooks in 1875. The radiometer is composed of four extremely light mica blades. One end of the blade is blackened and placed on a sharp needle. Reduce the resistance of the fan blade rotation. The black surface of the mica blade in the radiometer absorbs the radiant heat energy to increase the temperature, causing the average kinetic energy of nearby gas molecules to increase, while the silver surface reflects radiant energy, and the temperature does not change, and the average kinetic energy of nearby gas molecules does not change. When molecules collide completely elastically from the plane, their momentum changes to twice the incident momentum, so the molecules rebounding from the black end have greater momentum changes than the white end, that is, the black end receives more force than the white end, causing the blade to rotate clockwise. When it no longer receives radiant heat and gradually cools down, the blades rotate in reverse. Specifications: ► Product specifications: height 18.5cm / ball diameter 11cm ►Package size: 14.5 cm x 14.5cm x 22.5cm ► Material: glass/metal/mica ► Origin: China Precautions: ► Need to be exposed to the sun and heat bulbs (incandescent bulbs) ► In order to keep the mica blades extremely light, the mica blades in the radiometer are made of smoke blackened. During the manufacturing process, a small amount of mica powder (from the mica powder on the black mica sheet) may fall off, so every piece is It may be slightly attached to the glass sphere, which is a normal phenomenon and not a defect. We hereby inform you to avoid your misunderstanding and subsequent disputes. ► Glass products, please be careful of fragile (we will confirm that the products are not broken for you before shipment). ► For precision products, please do not shake them vigorously. ► Product photos may have color difference between the actual product and the photo due to the different shooting light and monitor. The final color is subject to the actual product.