Barn

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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What Wikipedia says

A barn (symbol: b) is a non-SI metric unit of area equal to 10−28 m2 (100 fm2). This corresponds to the area of a square with side 10−14 m (10 fm) or a circle of diameter approximately 1.128×10−14 m (11.28 fm).

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