pH
noun/ˌpiː ˈeɪtʃ/
/ˌpiː ˈeɪtʃ/
[singular] (chemistry)- a measurement of the level of acid or alkali in a solution or substance. In the pH range of 0 to 14 a reading of below 7 shows an acid and of above 7 shows an alkali.
- a pH of 7.5
- to test the pH level of the soil
Word Originearly 20th cent.: from p representing German Potenz ‘power’ + H, the symbol for hydrogen.Definitions on the go
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pH