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3 entries found for pH.
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Main Entry: pH
Pronunciation: 'pE-'Ach
Function: noun
Etymology: German, from Potenz power + H (symbol for hydrogen)
Date: 1909
: 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
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\&\ as a and u in abut
\&\ as e in kitten
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\a\ as a in ash
\A\ as a in ace
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\[th]\ as th in the
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\zh\ as si in vision
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