"Particle in the box" is a theoretical model in quantum mechanics that describes the behavior of a particle confined to a one-dimensional box or a three-dimensional box. The particle is restricted to move only within the boundaries of the box and is subject to certain boundary conditions, such as the particle's wavefunction being zero at the edges of the box. This model is often used to study the quantum behavior of particles in confined spaces and to understand concepts such as energy levels, wavefunctions, and probability distributions of particles in these systems.
