Example image of eyePlorer eyePlorer map for 'PH': Acid Base (chemistry) Solution Activity (chemistry) Cologarithm Hydrogen ion Activity coefficient Carlsberg Laboratory Chemist Danish people S. P. L. Sørensen Alkali Biology Chemistry Environmental science Food science Medicine Oceanography Logarithm Dimensionless quantity Nernst equation Electromotive force Glass electrode Saturated calomel electrode Silver chloride electrode Faraday constant Gas constant Concentration Calibration Galvanic cell ISO 31-8 Operational definition PH meter International Union of Pure and Applied Chemistry Acidity function Hammett acidity function Superacid Standard state Alkalinity Self-ionization of water Alkali soils Hydrochloric acid Sodium hydroxide Ion selective electrode PH indicator Acid dissociation constant Weak acid Weak base Litmus test (chemistry) Universal indicator