Digital pH meter

Digital pH meter

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Credit: SCIENCE PHOTO LIBRARY

Caption: Digital pH meter. The pH of a solution is a measure of acidity and alkalinity; it is defined as the inverse logarithm of the hydrogen ion concentration. The scale runs from 0 to 14, with pure water considered neutral at pH 7. Low numbers indicate acids, high numbers indicate alkalis.

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Keywords: acid, acidity, alkali, alkaline, alkalinity, chemical, chemistry, cut out, cut-out, cutout, digital meter, fluid, hydrogen ion concentration, immersion, instrument, laboratory, liquid, measurement, measuring, ph meter, physical chemistry, school, school science, science education, studio shot, white background

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