The Action Lab Extreme light experiment! 100,000 lumens vs radiometer Posted: 6 November 2025 | Last updated: 6 November 2025 In this video I see how fast we can get a radiometer to spin by shining ...

A Crookes radiometer, despite what many explanations claim, does not work because of radiation pressure. When light strikes the vanes inside the near-vacuum chamber, it heats the vanes, which then ...

It’s a simple device – a set of vanes mounted on a spindle, enclosed in a partially evacuated glass bulb. Each vane is silvered on one side and blackened on the other. When the Crookes radiometer is ...

Most people would recognize the device in the image above, although they probably wouldn’t know it by its formal name: the Crookes radiometer. As its name implies, placing the radiometer in light ...