# wavelength in vacuum

> for an electromagnetic wave propagating in vacuum, quotient of the vacuum speed of light and frequency

**Wikidata**: [Q80173663](https://www.wikidata.org/wiki/Q80173663)  
**Source**: https://4ort.xyz/entity/wavelength-in-vacuum


## References

1. ISO 80000-7:2008 Quantities and units—Part 7: Light