substance fraction, x

abbreviation: ISO
https://doi.org/10.1351/goldbook.S06075
Ratio of the amount-of-substance of the component to the total amount-of-substance in the system containing the component.
Notes:
  1. The term substance fraction is recommended for clinical chemistry, IUPAC also uses mole fraction and mole fraction.
  2. For clinical chemistry the term component is recommended, ISO uses 'substance'.
  3. For clinical chemistry the term system is recommended, ISO uses mixture.
Source:
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 994 [Terms] [Paper]
Citation: 'substance fraction' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S06075 RIS BibTex EndNote
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