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.
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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
A powerful man comes; he sees a crowd, ready bridled and with a bit in its teeth; he mounts and leads it.—Dial, et entr. ph.,
From Voltaire: A Sketch of his Life and Works by G. W. (George William) Foote
But why should phrase be spell’d with ph and s, and not f and z?
From Magazine, or Animadversions on the English Spelling (1703) by David Abercrombie
Meanwhile, the region around the anode, where oxidation takes place, could reach approximately pH 2.5, creating a strongly acidic environment.
From Science Daily ● Oct. 12, 2026
One particularly important factor is pH, a measure of how acidic or alkaline a substance is.
From Science Daily ● Oct. 12, 2026
Even when the overall solution was essentially neutral, the researchers estimated that conditions near the cathode, the electrode where reduction occurs, could reach approximately pH 11, making the area strongly alkaline.
From Science Daily ● Oct. 12, 2026
When a small electric potential was applied, it produced a carefully controlled change in pH inside the cornea.
From Science Daily ● Sep. 29, 2026
It is difficult, even hazardous work, requiring special suits and involving chemicals with high pH levels.
From "Shipwrecked!" by Martin W. Sandler
"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
Ph is used for f in words derived from the Greek, as philosopher, philanthropy, Philip.
From A Grammar of the English Tongue by Samuel Johnson
Se Ra Ph is the singular of seraphim, meaning Semiticé, splendour, fire, light; emblematic of the fiery disk of the sun and which, under the name of Nehushtan—“Serpent Dragon”—was broken up by the reforming Hezekiah.
From Ophiolatreia An Account of the Rites and Mysteries Connected with the Origin, Rise, and Development of Serpent Worship in Various Parts of the World by Anonymous
This experiment was repeated with the tinct. tolutanæ, ph. ed. and with sp, vinos. camp. and the result was entirely the same.
From Experiments and Observations on Different Kinds of Air by Joseph Priestley
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
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
M, cross-section of the root, × 25. x, wood. ph. bast, of the fibro-vascular bundle.
From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Douglas Houghton Campbell
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
Over the last few decades, “there was a lot of circumstantial evidence — people filming things with X-rays or triangulating sound with different hydrophones,” said Coen P.H.
From New York Times ● Mar. 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 situation is grim, especially in the coastal parts of Kerala, given the continuous rains,” P.H.
From Reuters ● Aug. 9, 2018
The Rison court found that the plaintiff, Zachariah P.H.
From Slate ● Oct. 17, 2014
Coming now to a higher group—the Sea-Anemones—Mr. P.H.
From Darwinism (1889) by Alfred Russel Wallace
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