Relative tension coefficient (Rel. tension coefficient)

Abbreviation	Rel. tension coefficient
Definition in words	Tension of component F in system 1 divided by coefficient of component G in system 2 Note 1: Coefficient needs to be specified. Note 2: Component F ≠ Component G Note 3: Component F is not related to or a part of component G
Definition by equation
Systematic terms	Relative tension coefficient of component B in system 1
Result type	Rational scale	Value sets are positive numerical values Algebraic operations are allowed (a=nb; a≠nb)	Numerical values from 0-∞
Unit	kPa/mol, kPa, kPa/kg, etc. Note 1: The denominator unit depends on the coefficient.
Special rule(s) in the NPU syntax	The catalytic component (component F) is termed according to the International Enzyme Nomenclature (see Medical and metrological vocabulary). “Procedure” is stated in the specification to the kind-of-property in the NPU definition. “Procedure” indicates that the measurement procedure must be stated somewhere else than the NPU code and there may be difficulties in comparing values for the same NPU code. The coefficient must be specified in the specification to the kind-of-property in the NPU definition.
Reference	Ferard G, Dybkaer R, Fuentes-Arderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. doi:10.1039/9781782622451.

Laboratory field	Examples
Clinical Biochemistry	Example 1
	Generic abbreviated	NPU63398 Plasma(arterial Blood)—Oxygen; Relative tension coefficient(Arteriel plasma/Lung; Tension/Volume fraction;procedure) = ? kilopascal
	Full result	NPU63398 Plasma(arterial Blood)—Oxygen; Relative tension coefficient(Arteriel plasma/Lung; Tension/Volume fraction;procedure) = ? kilopascal
	Abbreviated result	NPU63398 P(aB)—Oxygen; Rel. tension coefficient(Arteriel plasma/Lung; Tension/Volume fraction;proc.) = ? kP
	Written expression	The tension of Oxygen in Mr. Smith’s arterial blood divided by coefficient (Volume fraction) of oxygen in Mr. Smith’s lungs is [30] kPa. The measurement is performed according to a procedure defined by the laboratory.
	Equation
Reference	NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/

Dybkaer R. Concept system on ‘quantity’: formation and terminology. Accredit Qual Assur. 2013;18(3):253-60.
Dybkaer R. ISO terminological analysis of the VIM3 concepts ‘quantity’ and ‘kind-of-quantity’. Metrologia. 2010;47(3):127-34.