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 ...

The radiometer consists of four vanes are black on one side and white on the other, able to freely rotate about a pivot in a partial vacuum. When light shines on the vanes broadly, the vanes rotate ...

I HAVE noticed that the theory of this instrument is usually shirked in elementary books, even the best of them confining themselves to an account, and not attempting an explanation. 1 Indeed, if it ...

In this video I see how fast we can get a radiometer to spin by shining the world's brightest flashlight on it. Then I talk about the real reason the Crookes radiometer spins when you shine light on ...

Researchers at the University of Texas at Austin have miniaturised a toy into a tiny motor that could one day power medical devices or harvest solar energy. The device, called a radiometer, is based ...