IEVref: 114-01-24 ID: Language: en Status: Standard Term: ionic strength Synonym1: Synonym2: Synonym3: Symbol: I Definition: for all types of ions in a solution, half the sum of the products of their molality bi and the square of their charge number zi $I=\frac{1}{2}\sum {z}_{i}^{2}{b}_{i}$ Note 1 to entry: Charge number is a quantity of dimension one defined in 113-05-17. Note 2 to entry: The coherent SI unit of ionic strength is mole per kilogram, mol/kg. Note 3 to entry: This entry was numbered 111-15-29 in IEC 60050-111:1996. It has been modified as follows: a formula has been added. Publication date: 2014-03 Source: Replaces: Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: