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Did you mean: tunnel?
Worth knowing
A tunnel is an underground passageway, completely enclosed except for openings for ingress and egress, commonly at each end. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers. Other uses include routing power or telecommunication cables, some are to permit wildlife such as European badgers to cross highways.
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The Channel Tunnel is a undersea rail tunnel beneath the English Channel at the Strait of Dover. At its lowest point, it is deep. The ventilation system can control smoke movement. Special arrival sidings exist to accept a train that is on fire, as the train is not allowed to stop whilst on fire in the tunnel.
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Quantum tunnelling refers to the quantum mechanical phenomenon where a particle tunnels through a barrier that it classically could not surmount. This plays an essential role in several physical phenomena, such as the nuclear fusion that occurs in main sequence stars like the sun, and has important applications to modern devices such as the tunnel diode. The effect was predicted in the early 20th century and its acceptance, as a general physical phenomenon, came mid-century. As a consequence of the wave particle duality of matter, tunnelling is often explained using the Heisenberg uncertainty principle. Purely quantum mechanical concepts are central to the phenomenon, so quantum tunnelling is one of the defining features of quantum mechanics and the particle wave duality of matter.
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