ˈpē-ˈāch
How to pronounce pH (audio)

Definition of pH

(Entry 1 of 2)

: 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

Definition of PH (Entry 2 of 2)

First Known Use of pH

Noun

1909, in the meaning defined above

History and Etymology for pH

Noun

German, from Potenz power + H (symbol for hydrogen)

More Definitions for pH

ˈpē-ˈāch
How to pronounce pH (audio)

: a measure of the acidity or alkalinity of a substance

Lemon juice has a pH of about 2.5. Water has a pH of 7.

Medical Definition of ph

(Entry 1 of 2)

(ˈ)pē-ˈāch
How to pronounce pH (audio)

Medical Definition of pH (Entry 2 of 2)

: 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

instead of saying that the concentration of hydrogen ion in pure water is 1.00 x 10−7, it is customary to say that the pH of pure water is 7— Linus Pauling

also

: the condition represented by such a number — compare pk

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