# Brownian ratchet

> thought experiment and instance of a perpetual motion machine of the second kind

**Wikidata**: [Q1777915](https://www.wikidata.org/wiki/Q1777915)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Brownian_ratchet)  
**Source**: https://4ort.xyz/entity/brownian-ratchet


## References

1. Freebase Data Dumps. 2013