Term: relative https://doi.org/10.1351/goldbook.R05255 Definition: Quotient of quantities having the same kind-of-quantity in different systems. Notes: 0) The denominator quantity is often called the reference quantity. 1) Preferentially the same component is found in the numerator and denominator quantity. Related Terms: 1) kind-of-quantity (http://doi.org/10.1351/goldbook.K03393). Source: PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 989 (https://doi.org/10.1351/pac199668040957) Citation: 'relative' 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.R05255 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.