# bel

> logarithmic unit expressing the ratio of a physical quantity

**Wikidata**: [Q50098](https://www.wikidata.org/wiki/Q50098)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Bel_(unit))  
**Source**: https://4ort.xyz/entity/bel-q50098


## References

1. ISO 80000-1:2009 Quantities and units—Part 1: General
2. ISO 80000-3:2006 Quantities and units — Part 3: Space and time