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The walls of a one-dimensional box may be visualised as regions of space with an infinitely large potential energy.
Conversely, the interior of the box has a constant, zero potential energy .< ref > Actually, any constant, finite potential can be specified within the box.
This merely shifts the energies of the states by .</ ref > This means that no forces act upon the particle inside the box and it can move freely in that region.
However, infinitely large forces repel the particle if it touches the walls of the box, preventing it from escaping.
The potential energy in this model is given as

1.887 seconds.