physics, the particle in a box (also known as the infinite potential well or the infinite square well)
is a problem consisting of a single particle inside of an infinitely deep potential well, from which it cannot
escape, and which loses no energy
when it collides with the walls of the box. In classical mechanics, the solution to
the problem is trivial: The particle moves in a straight line, always at the
same speed, until it reflects from a wall.