ph
phot; phots.
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ph
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pH
pHthe symbol for the logarithm of the reciprocal of hydrogen ion concentration in gram atoms per liter, used to express the acidity or alkalinity of a solution on a scale of 0 to 14, where less than 7 represents acidity, 7 neutrality, and more than 7 alkalinity.
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Ph
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ph.
ph.abbreviationphase.
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P.H.
P.H.abbreviationPublic Health.
ph
1 AmericanOptics.
pH
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American
Chemistry.
Ph
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abbreviation
Chemistry.
ph.
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abbreviation
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phase.
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phone.
P.H.
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ph
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pH
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noun
ph.
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abbreviation
Ph
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symbol
pH
Scientific
/ pē′āch′ /
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A numerical measure of the acidity or alkalinity of a solution, usually measured on a scale of 0 to 14. Neutral solutions (such as pure water) have a pH of 7, acidic solutions have a pH lower than 7, and alkaline solutions have a pH higher than 7. The pH of lemon juice is 2.4; that of household ammonia is 11.5. The normal pH for human blood is 7.4.
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◆ The letters pH stand for potential of hydrogen, since pH is effectively a measure of the concentration of hydrogen ions (that is, protons) in a substance. The pH scale was devised in 1923 by Danish biochemist Søren Peter Lauritz Sørensen (1868–1969).
pH
Cultural
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Having been raised with a language that contains such combinations as "rhythm," "syzygy" and "gnathic," and in which gh, ph and ff can all sound alike, I don't see what the fuss is about.
From Time Magazine Archive
Such absurdities as having f, ff, gh and ph represent one single sound would be eliminated.
From Time Magazine Archive
Mom talks to Carol, the receptionist explains something on the ph one, and Jason’s mother and Mrs. Frost discuss good restaurants that accommodate wheelchairs.
From "Rules" by Cynthia Lord
Only last week we heard that Mr. White, of Winchmore Hill, has perished in the search for Dendrobium ph.
From About Orchids A Chat by Frederick Boyle
The pharynx, ph, has here the outline of an irregular V. Its walls, except at the outer 11 angles of the clefts, g1, are composed of but a single layer of cells.
From Development of the Digestive Canal of the American Alligator by C. M. Reese
As CO2 increases, the body can retain additional bicarbonate to help keep blood pH stable.
From Science Daily ● Aug. 15, 2026
Hudson needed water flushed through each eye to correct their pH balance, and Jodanna, from Bridgend, said it was "horrendous as a parent to watch him go through that".
From BBC ● Aug. 11, 2026
By manipulating each tank's temperature and pH levels, scientists can simulate future heatwaves and induce coral bleaching to see how fish and other organisms adapt.
From Barron's ● Jul. 29, 2026
With both types of sparkling water, pH had returned to nearly its starting level within 20 minutes.
From Science Daily ● Jul. 27, 2026
Hardly giving us time to breathe, Ms. Faraci launched into her lecture on acids and bases and the importance of a neutral pH.
From "We Are the Ants" by Shaun David Hutchinson
"The lichens that live on the granite need this acidic environment to exist and the paint has basically changed the Ph and chemistry of the rock."
From BBC ● May 4, 2022
Even the rain water that lands on the maintenance is harvested, and put through a sulfur burner if the Ph is too acidic.
From Golf Digest ● Oct. 16, 2013
Photograph: Ph: Zade Rosenthal The runaway success of Avengers Assemble helped Cineworld almost double pre-tax profits to £13.4m in the first half of 2012, despite an almost 12% year-on-year fall in cinema advertising.
From The Guardian ● Aug. 16, 2012
For example, plumber's solder melts at a lower temperature than either Ph or Sn, of which it is composed.
From An Introduction to Chemical Science by Rufus Phillips Williams
Ph has the sound of f in philosophy, Philip; and of v in nephew, Stephen.
From English Grammar in Familiar Lectures by Samuel Kirkham
THROR, ph. from v. throa, to increase, to amplify.
From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson
DURINN, prob. from dur, a light sleep, to fall asleep; whence prob. the E. to doze, and ph. also dusk.
From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson
VANIR, beautiful; with the L. venustus and Venus, and ph. with the E. wench.
From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson
BRAGI, the name of the God of Poetry; from braga, to glisten, to shine, or from bragga, to adorn; ph. cog. with G. pracht, splendour.
From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson
NAUT, ph. from the v. njota, to make use of.
From The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson by Saemund Sigfusson
Mr. Nargeolet, who went by P.H., had become a semi-permanent fixture, a quasi-member of Titanic royalty, a star and co-pilot on the OceanGate expeditions.
From New York Times ● Jul. 2, 2023
None of the articles — on, for example, Oscar Wilde, the poet Tasso and the neglected comic novelist P.H.
From Washington Post ● Jul. 1, 2020
The Rison court found that the plaintiff, Zachariah P.H.
From Slate ● Oct. 17, 2014
He found it in Connersville, Indiana, where the P.H.
From Scientific American ● Feb. 21, 2014
A coal merchant by the name of Rolph had displaced P.H.
From Port O' Gold A History-Romance of the San Francisco Argonauts by Louis J. (Louis John) Stellman
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
