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The log to the base 10 of the concentration of Hydrogen ions (H+) in a solution times -1.
pH = -log10[H+]
This measures the acidity of a solution. A low pH indicates a high concentration of H+(and therefore a low concentration of OH-) which is an acidic solution, and a high pH is found in alkaline solutions (low H+ and high OH-). Neutral is 7 - the pH of water, when there are the same number of H+ ions as OH- ions.
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