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  • An expression of the intensity of the basic or acidic condition of a liquid or of soil; the logarithmic scale ranges from 0 to 14, where 0 is the most acid, 7 is neutral, and above 7 is alkaline. Natural waters usually have a pH between 6.5 and 8.5. Plants have differing tolerances for acidity and alkalinity.
  • The measurement of acidity or alkalinity. A pH of 7 is neutral; less than 7 is acid; greater than 7 is basic or alkaline.
    Source: Anthromorphemics
  • The negative logarithm of the hydrogen ion concentration of a solution. It is the quantitative expression of the acidity and alkalinity of a solution and has a scale that ranges from about 0 to 14. pH 7 is neutral; <7 is acidic; and >7 is alkaline.
    Source: Atmospheric Chemistry Glossary
  • a symbol denoting the relative concentration of hydrogen ions in a solution; pH values range from 0 to 14; the lower the value the more acid, or hydrogen ions, in the solution, with pH 7 being neutral
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • a measure of the acidity or basicity of a solution.

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