quantum tunneling

This term describes a counterintuitive phenomenon in quantum mechanics where a particle behaves as a wave, allowing it to pass through an energy barrier that would be impassable according to classical physics. It is a technical term used primarily in physics, chemistry, and electronics, carrying a neutral, scientific connotation.

In practical application, this concept is essential for explaining the operation of flash memory and scanning tunneling microscopes, as well as the nuclear fusion processes that power stars. Because it refers to a specific physical process, it is treated as an uncountable noun and does not have a plural form.