- 48

- 2

- Summary
- is there a known equation that describes the relationship between a crookes radiometer rotation speed and the pressure of its environment?

I am experimenting with using a radiometer as an approximate indicator of pressure in my homemade high vacuum system, running a small turbo pump. I am interested in the relationship between pressure and vane rotation speed, with light intensity being constant.

I have only been able to find vague numbers stating the the radiometric effect starts to occur at a few hundred Pa, has a maximum at 1Pa, and disappears around 10-4 Pa.

How may I develop a model of this to work off of?

I have only been able to find vague numbers stating the the radiometric effect starts to occur at a few hundred Pa, has a maximum at 1Pa, and disappears around 10-4 Pa.

How may I develop a model of this to work off of?