Summary
A barrier impossible in classical terms can be crossed with a small quantum probability. This matters from atomic scale devices to modern electronics.
A ball passing through a wall sounds absurd, but the analogy partly works in quantum land. Particles have wave-like behavior that allows leakage.
In tunneling, the wave function extends into the barrier. This creates a small but nonzero chance of appearing on the other side.
The principle affects leakage currents and enables ultra sensitive instruments at small scales. At the atomic level, impossible often means low probability.
Quantum physics keeps challenging intuition. Engineering can turn that weirdness into a practical advantage.
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