: a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity and higher numbers increasing alkalinity and on which each unit of change represents a tenfold change in acidity or alkalinity and that is the negative logarithm of the effective hydrogen-ion concentration or hydrogen-ion activity in gram equivalents per liter of the solution
also
: the condition represented by a pH number
1
pinch hit
2
public health
3
Purple Heart
Examples of pH in a Sentence
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Leanne Potts, Better Homes & Gardens, 17 Sep. 2024
This is because lower gastric pH facilitates better iron absorption.
—Stephen C. George, Discover Magazine, 12 Feb. 2024
Then several sample portions are measured for nutrient content, pH and organic matter.
—Lauren David, Washington Post, 13 Nov. 2023
Soil pH is defined as the acidity or alkalinity of the soil.
—Rita Perwich, San Diego Union-Tribune, 4 Nov. 2023
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Noun
Lower Soil pH Wood ash has a high pH, usually around 10 to 12, says Chelsea McKinley, plant health specialist at the U.S. Botanic Garden in Washington, D.C.
—Leanne Potts, Better Homes & Gardens, 17 Sep. 2024
This is because lower gastric pH facilitates better iron absorption.
—Stephen C. George, Discover Magazine, 12 Feb. 2024
Then several sample portions are measured for nutrient content, pH and organic matter.
—Lauren David, Washington Post, 13 Nov. 2023
Soil pH is defined as the acidity or alkalinity of the soil.
—Rita Perwich, San Diego Union-Tribune, 4 Nov. 2023
See all Example Sentences for pH
Dictionary Entries Near pH
Cite this Entry
“PH.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pH. Accessed 1 Dec. 2024.
Copy CitationKids Definition
pH
noun
: a number used in expressing acidity or alkalinity on a scale whose values run from 0 to 14 with 7 representing neutrality, numbers less than 7 increasing acidity, and numbers greater than 7 increasing alkalinity
also
: the condition represented by such a number
Medical Definition
ph
1 of 2 abbreviation1
pharmacopoeia
2
phosphor
3
phot
pH
2 of 2 noun
: a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity and higher numbers increasing alkalinity and on which each unit of change represents a tenfold change in acidity or alkalinity and that is the negative logarithm of the effective hydrogen-ion concentration or hydrogen-ion activity in gram equivalents per liter of the solution
instead of saying that the concentration of hydrogen ion in pure water is 1.00 x 10−7, it is customary to say that the pH of pure water is 7—Linus Pauling
Linus Pauling
also
: the condition represented by such a number compare pk
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