Editing Free particle (section)

{{Short description|Particle that is not bound by an external force}}
In [[physics]], a '''free particle''' is a particle that, in some sense, is not bound by an external [[force]], or equivalently not in a region where its [[potential energy]] varies. In [[classical physics]], this means the particle is present in a "field-free" space. In [[quantum mechanics]], it means the particle is in a region of uniform potential, usually set to zero in the region of interest since the potential can be arbitrarily set to zero at any point in space.