# particle number operator

> operator in quantum mechanics whose eigenvalues label states with the number of particles in the system in those states

**Wikidata**: [Q3277876](https://www.wikidata.org/wiki/Q3277876)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Particle_number_operator)  
**Source**: https://4ort.xyz/entity/particle-number-operator


## References

1. Freebase Data Dumps. 2013