Aqua regia

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.

At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Aqua regia (; from Latin, "regal water" or "royal water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar mixing ratio of 1:3. Aqua regia is a fuming liquid.

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

Image: Daniel Grohmann, CC BY-SA 3.0, via Wikimedia Commons.