---
title: How a Crookes Radiometer Works — HIGH T3CH
url: https://hight3ch.com/how-a-crookes-radiometer-works/
date: 2014-11-21
---

# How a Crookes Radiometer Works

A Crookes radiometer is driven by a thermal gas effect, and not “light pressure” as often thought. I demonstrate the radiometer in a vacuum chamber and explain its optimal running pressure.