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Definition: Symbol for the negative decadic logarithm of the H+ ion concentration (measured in moles per liter); a solution with pH 7.00 (1 × 10-7 g molecular weight of H+K per liter) is neutral at 22°C ([H+] = [OH-]), one with a pH value of more than 7.00 is alkaline, one with a pH lower than 7.00 is acid. At 37°C, neutrality is at a pH value of 6.80.

[p (power or potency) of [H+ ]]

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