Dalton

Rarity: Rare

A topic known well beyond its field, found in many languages.

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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What Wikipedia says

The dalton (symbol: Da), or unified atomic mass unit (symbol: u), is a unit of mass defined as ⁠1/12⁠ of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.

Excerpt from the Wikipedia article “Dalton (unit)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jia.liu, Public domain, via Wikimedia Commons.