The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Synonyms: Concentration, Hydrogen-Ion, pH, Hydrogen Ion Concentration, Hydrogen-Ion Concentrations, Concentrations, Hydrogen-Ion, Hydrogen-Ion Concentration