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 a region of constant potential, usually set to zero in the region of interest since potential can be arbitrarily set to zero at any point (or surface in three dimensions) in space.
Read more about Free Particle: Classical Free Particle, Relativistic Free Particle
Famous quotes containing the words free and/or particle:
“It may be affirmed, without extravagance, that the free institutions we enjoy, have developed the powers, and improved the condition, of our whole people, beyond any example in the world.”
—Abraham Lincoln (1809–1865)
“Each particle is a microcosm, and faithfully renders the likeness of the world.”
—Ralph Waldo Emerson (1803–1882)