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pH British & World English

A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline. The pH is equal to −log10 c, where c is the hydrogen ion concentration in moles per litre

PH British & World English

Public Health

pH-stat British & World English

A device for automatically maintaining a solution at constant pH.