Crookes Radiometer Double
Crookes Radiometer Double is a fascinating scientific instrument designed to demonstrate the conversion of light energy into mechanical motion. Often referred to as a “light mill,” this device consists of an airtight glass bulb mounted on a stand, containing two sets of lightweight vanes that are free to rotate on a spindle. Each vane is blackened on one side and polished or silvered on the other, allowing the device to respond to radiant energy, particularly visible light or infrared radiation.
When exposed to light, heat, or other radiant energy, the vanes inside the radiometer begin to spin. The black surface absorbs more radiation and heats the surrounding air molecules, while the reflective surface absorbs less. This temperature difference creates a pressure imbalance at the molecular level, causing the vanes to rotate. The double radiometer design features two rotating assemblies within a single bulb, enhancing the visual effect and allowing for comparative demonstrations.
Features:-
- Double Radiometer Mechanism – Two independent vane systems mounted within one bulb for enhanced demonstration.
- High-Quality Glass Bulb – Airtight and transparent for clear visibility and smooth functioning.
- Light-Responsive Vanes – Blackened on one side and silvered on the other, sensitive to light and radiant energy.
- Educational Value – Perfect for teaching concepts of thermodynamics, kinetic theory of gases, and radiation pressure.
- Attractive Display Piece – Also serves as a decorative and interactive scientific novelty item.
