# Stefan-Boltzmann constant

> ratio between the radiative power of a black body to the fourth power of its temperature

**Wikidata**: [Q51374](https://www.wikidata.org/wiki/Q51374)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Stefan–Boltzmann_constant)  
**Source**: https://4ort.xyz/entity/stefan-boltzmann-constant


## References

1. Freebase Data Dumps. 2013
2. [Source](http://physics.nist.gov/cgi-bin/cuu/Value?sigma)