As in the particleinabox, it is the boundary conditions that force us to quantize the energy.
象在箱中粒子那样，边界条件迫使我们使能量量子化。
2
Thus, confinement effects modify electron energy levels, similar to aparticleinabox, whereby Coulomb blockade effect arises as a consequence of the discrete nature of electric charges.
When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge.