# Fermi-Dirac statistics facts for kids

**Fermi-Dirac statistics** is a branch of quantum statistics. It is named after Enrico Fermi and Paul Dirac. It is used to describe the macroscopic state of a system which is made of many simliar particles (Fermions). One example is to describe the state of electrons in metals and semimetals, to describe electrical conductivity.

Fermi-Dirac statistics makes the following assumptions:

- None of the states of the particles can hold more than one particle (known as Pauli exclusion principle)
- Exchanging a particle for another similar particle will not lead to a new state, but will give the same state (known as Identical particles)

The **Fermi distribution** tells with what probability, a Fermi gas, at a given temperature and energy level, will have a particle in the given state.

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