PH | Definition, Uses, & Facts | Britannica
pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ionwhich ordinarily ranges between about 1 and 10−14 gram-equivalents per litreinto nuers between 0 and 14. In pure water, which is neutral (neither acidic nor …
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