pH.
Measure of the acidity (low pH) or basicity (high pH) of an aqueous solution, equal to the negative logarithm of the concentration of hydronium ions in molars.
Meaning & usage
Measure of the acidity (low pH) or basicity (high pH) of an aqueous solution, equal to the negative logarithm of the concentration of hydronium ions in molars.
Where this word comes from
Originally introduced in 1909 by S. P. L. Sørensen, using the notation p_(H⁺) for what he called the “hydrogen ion exponent” (Wasserstoffionenexponent) of a solution. He may have chosen the symbol p arbitrarily; another suggestion is that it either an abbreviation of French puissance, German Potenz, Danish potens (“power”) or English potential. The H is the international chemical symbol for the element hydrogen.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.