Ehrenfest theorem

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.

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Notion

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Science and technology

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What Wikipedia says

The Ehrenfest theorem, named after Austrian theoretical physicist Paul Ehrenfest, relates the time derivative of the expectation values of the position and momentum operators x and p to the expectation value of the force

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

Image: Keenan Pepper, CC BY-SA 2.0, via Wikimedia Commons.