Population inversion

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in a state in which more members of the system are in higher, excited states than in lower, unexcited energy states.

Excerpt from the Wikipedia article “Population inversion”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Shahriarh91, CC BY-SA 4.0, via Wikimedia Commons.