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PH

Synonym(s)

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.: Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.


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