CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Digital pH meter in an acidic solution. The pH of a solution is a measure of acidity and alkalinity; the smaller the number, the more acidic the solution. Here, the pH meter is showing 2.00, indicating a strong acid. The scale runs from 0- 14, with pure water considered neutral at pH 7.
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