# Darcy friction factor

> characteristic number for the pressure drop in a pipe due to friction in a laminar or turbulent flow

**Wikidata**: [Q1253446](https://www.wikidata.org/wiki/Q1253446)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Darcy_friction_factor_formulae)  
**Source**: https://4ort.xyz/entity/darcy-friction-factor


## References

1. ISO 80000-11:2019 Quantities and units — Part 11: Characteristic numbers