IEVref: 112-01-28 ID: Language: en Status: Standard Term: value of a quantity Synonym1: quantity value [Preferred] Synonym2: value [Preferred] Synonym3: Symbol: Definition: number and reference together expressing magnitude of a quantity Note 1 to entry: According to the type of reference, the value of a quantity is either: a product of a number and a unit of measurement (the unit one is generally omitted for quantities of dimension one, as in examples f and g): a) Length of a given rod: 5,34 m or 534 cm b) Mass of a given body: 0,152 kg or 152 g c) Curvature of a given arc: 112 m–1, expressed in words by "one hundred and twelve per metre" d) Celsius temperature of a given sample: –5 °C e) Electric impedance of a given circuit element at a given frequency, where j is the imaginary unit: (7,5 + 3,2 j) Ω f) Refractive index of a given sample of glass: 1,32 g) Mass fraction of cadmium in a given sample of copper: 3 µg/kg or 3 × 10–1 h) Molality of Pb2+ in a given sample of water: 1,76 mmol/kg a number and a reference to a measurement procedure: Rockwell C hardness of a given sample: 43,5 HCR a number and a reference material: Arbitrary amount-of-substance concentration of lutropin in a given sample of human blood plasma (WHO International Standard 80/552 used as a calibrator): 5,0 IU/l, where "IU" stands for "WHO International Unit" In the first case, the value of a quantity Q is generally denoted {Q}[Q] where {Q} is the numerical value and [Q] is the unit of measurement. Note 2 to entry: The number can be complex (see example e in Note 1 to entry). Note 3 to entry: The value of a quantity can be presented in more than one way (see examples a, b, and g in Note 1 to entry). Note 4 to entry: In the case of vector or tensor quantities, each component has a value, and the same for the magnitude of a vector quantity. Example: force acting on a given particle, e.g. in Cartesian components (Fx; Fy; Fz) = (–31,5; 43,2; 17,0) N Publication date: 2019-01 Source: ISO/IEC Guide 99:2007, 1.19, modified – Transposition of the English preferred term and synonym. Combination of EXAMPLE 1 to EXAMPLE 10 in a new Note 1 to entry, and deletion of NOTE 1. Replaces: 112-01-28:2010-01 Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: