PH

Rarity: Ultra rare

A topic known all over the world: only a few thousand cards.

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

Class

Notion

Domain

Science and technology

In collections

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What Wikipedia says

In chemistry, pH ( or ; pee-AYCH) is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions (solutions with higher concentrations of hydrogen (H+) cations) are measured to have lower pH values than basic or alkaline solutions.

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

Image: Sébastien Bruneau, Public domain, via Wikimedia Commons.