Partial pressure ( - Dynamic NPU Manual

Partial pressure (


Vapour pressure


Definition in words

Substance fraction of component B times pressure of gaseous system 1

Definition by equation

Systematic terms

Partial pressure 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-∞


Pa, kPa, etc.


  1. IUPAC Gold Book.
  2. BIPM brochure.
  3. 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


Clinical Chemistry

Generic abbreviated
NPU04079 Alveolar gas—Carbon dioxide; = ? kPa
Full result NPU04079 Alveolar gas—Carbon dioxide; partial pressure = 5 kilopascal
Abbreviated result NPU04079 Alveolar gas—Carbon dioxide; = 5 kPa
Written expression The partial pressure of Carbon dioxide in Mr Smith’s alveolar gas is [5] kPa.


  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Partial pressure


  • 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.
Date Term Note
1996-01-01 Partial pressure Term established.
Date Note Example
2019-08-30 Parital pressure refers to a gasseous system. Gas tension (tension) refers to a liquid system.