Definition of pH
: 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
From the M-W Editors
Origin and Etymology of ph
German, from Potenz power + H (symbol for hydrogen)
First Known Use: 1909
PH
Definition of PH
1 pinch hit
2 public health
3 Purple Heart
PH Defined for English Language Learners
pH
playDefinition of pH for English Language Learners
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: a number between 0 and 14 that indicates if a chemical is an acid or a base
Medical Dictionary
ph
Medical Definition of ph
1pharmacopoeia
2phosphor
3phot
pH
playMedical Definition of pH
: 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; also : the condition represented by such a number—compare pk
Learn More about ph
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Spanish Central: Translation of pH Nglish: Translation of pH for Spanish speakers Britannica.com: Encyclopedia article about pH
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