19K views · 268 reactions | Radiometers: three “light mills” from my...

Double Radiometer: a rare version of this classic physics toy with two rotators enclosed in the same partial vacuum chamber. Light heats up the vanes which then heat up the very thin gas left in the bulb- the black side of the vane is hotter and any gas molecules that comes into contact with the black fly off at a faster speed imparting impulse to the rotor. The bottom rotor has black on the right side of each vane and rotates clockwise, the top rotor has black on the left sides and thus has the

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

#physicstoy #physicsdemo crooks radiometer. #light #physics | Rhett Allain