PH
Measure of the level of acidity or basicity of an aqueous solution
Summary
In chemistry, pH is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. While the origin of the symbol 'pH' can be traced back to its original inventor, and the 'H' refers clearly to hydrogen, the exact original meaning of the letter 'p' in pH is still disputed; it has since acquired a more general technical meaning that is used in numerous other contexts.
Originally created by Ddroar
10/31/2001, 12:08:27 PM
Modified
5/31/2026, 3:40:28 PM
Recent revisions
reformated refs | Altered first2. Added pmid. | [[:en:WP:UCB|Use this tool]]. [[:en:WP:DBUG|Report bugs]]. | #UCB_Gadget
/* pH in food */
[[WP:CVPI|Interceptor]]: Reverting [[WP:AGF|good-faith]] edits by [[Special:Contributions/Bøttle-x|Bøttle-x]]: mot necessary
/* */
expired protection
Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.9.5) ([[User:Aldorias|Aldorias]] - 29284
/* Electronically measuring */ Retitled sub-s. as "First electronic measurement"
/* History */ Added sub-headings
Comparable values near one another should be all spelled out or all in figures, even if some of the numbers would (or could) normally be written differently; per [[WP:COMPARABLE]].
Added bibcode. | [[:en:WP:UCB|Use this bot]]. [[:en:WP:DBUG|Report bugs]]. | Suggested by Abductive | #UCB_toolbar
Adding page protection template
Changed protection settings for "[[PH]]": Persistent [[WP:Disruptive editing|disruptive editing]] ([Edit=Require autoconfirmed or confirmed access] (expires 13:37, 3 April 2026 (UTC)) [Move=Require administrator access] (indefinite))
Reverted edits by [[Special:Contributions/~2026-50589|~2026-50589]] ([[User talk:~2026-50589|talk]]) ([[WP:HG|HG]]) (3.4.14)
Reverting edit(s) by [[Special:Contributions/~2026-29645|~2026-29645]] ([[User_talk:~2026-29645|talk]]) to rev. 1329764250 by ~2025-43371-40: pH does not mean "potential of Hydrogen" [[w:en:WP:RW|(RW 16.1)]]
/* History? */ removed question mark from section title
/* Definition */ Updated the definition of hydrogen ion activity for clarity.
