In statistical mechanics, **Bose-Einstein statistics** means the statistics of a system where you can not tell the difference between any of the particles, and the particles are bosons. Bosons are fundamental particles like the photon.

The Bose-Einstein distribution tells you how many particles have a certain energy. The formula is

with and where:

*n(ε)* is the number of particles which have energy ε
*ε* is the energy
- μ is the chemical potential
*k* is Boltzmann's constant
*T* is the temperature

If , then the Maxwell–Boltzmann statistics is a good approximation.