Reference Terms
from Wikipedia, the free encyclopedia

PH

pH is a measure of the activity of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity.

Aqueous solutions with pH values lower than 7 are considered acidic, while pH values higher than 7 are considered alkaline.

Note:   The above text is excerpted from the Wikipedia article "PH", which has been released under the GNU Free Documentation License.
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July 31, 2015

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