Potassium sodium tartrate

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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Science and technology

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What Wikipedia says

Potassium sodium tartrate tetrahydrate, also known as Rochelle salt, is a double salt of tartaric acid first prepared (in about 1675) by an apothecary, Élie Seignette, of La Rochelle, France. Potassium sodium tartrate and monopotassium phosphate were some of the early materials discovered to exhibit piezoelectricity.

Excerpt from the Wikipedia article “Potassium sodium tartrate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ERS ROHU, CC BY 4.0, via Wikimedia Commons.