CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Electrometrical measurement of the pH of red meat. This indicates acidity and alkalinity. The more free ions present, the more acidic the solution is said to be. Here, the pH meter is showing 9.03, indicating a weak alkali. The scale runs from 0-14, with pure water considered neutral at pH 7.
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