# ISO 14912:2003 — Withdrawn and superseded ISO standards

For ISO 14912:2003, item title is Gas analysis — Conversion of gas mixture composition data; status code is 9599; successor is ISO 14912:2025 | ISO/NP 14912; withdrawn / published date is 2003-03-03, recorded from its source on 2026-08-05.

- **Identifier:** ISO 14912:2003 _(verified: appears in the quote below)_
- **Item title:** Gas analysis — Conversion of gas mixture composition data _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 14912:2025 | ISO/NP 14912
- **Withdrawn / published date:** 2003-03-03 _(verified: appears in the quote below)_

## What the source says

> 25214,IS,,ISO 14912:2003,Gas analysis — Conversion of gas mixture composition data,Analyse des gaz — Conversion des données de composition de mélanges gazeux,2003-03-03,1,['71.040.40'],ISO/TC 158,9599,,"[85580,69476]",['en'],58,"<p>ISO 14912:2003 defines the following quantities commonly used to express the composition of gas mixtures: mole fraction, mass fraction and volume fraction, as well as mole concentration, mass concentration and volume concentration.</p><p>Relating to these quantities of composition, ISO 14912:2003 provides methods for the conversion between different quantities and the conversion between different state conditions. Conversion between different quantities means calc

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).