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English definition of “pH”

pH

noun [C usually singular]     /ˌpiːˈeɪtʃ/
a number that shows how strongly acid or alkaline a substance is, in a range from 0 to 14: Below pH 6.5 is acid, above pH 7.5 is alkaline. The soil in our garden has a low/high pH.Miscellaneous units of measurementChemistry - general words
(Definition of pH noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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