Foreword

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This document was prepared by Technical Committee ISO/TC 193, Natural gas.

This third edition cancels and replaces the second edition (ISO 14532:2014), which has been technically revised.

The main changes are as follows:

All general and well-known terms that are not specific for natural gas and can be found in publicly available sources have been deleted.
All terms that are too specific to a certain topic in the field of natural gas have been deleted.
Some definitions have been modified or generalized to avoid becoming too specific to a certain topic in the field of natural gas.
Relevant terms from all ISO/TC 193 documents published since 2014 have been added.
The index has been deleted.
The annex containing the indices, symbols and units has been deleted.
An annex containing a list of terms defined in ISO/IEC Guide 98-3 and ISO/IEC Guide 99 has been added.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

ISO/TC 193 Natural gas was established in May 1988. Its current scope is:

to standardize terminology, quality specifications, methods of measurement, sampling, analysis and testing, including thermophysical property calculation and measurement, from production to delivery to all possible end users across national boundaries, for:
- natural gas;
- natural gas substitutes;
- mixtures of natural gas with other gaseous fuels (such as unconventional and renewable gases);
- wet gas.
to standardize methods of analysis of liquefied natural gas (LNG).

The aim is to create a coherent body of standards which support each other with regard to their definitions. Common and unambiguous terms and definitions are the starting point for understanding and applying International Standards.

The intention of this document is to incorporate the reviewed terms and definitions into ISO/TC 193 standards.

The presentation of this document has been arranged to facilitate its use as follows:

Notes are given under numerous definitions where it was deemed important to give informative guidance for a given definition. The notes are not considered a part of the definition.

The terms and definitions have been reviewed and studied in order to cover all aspects of any particular term with input from other sources such as European Standards from the European Committee for Standardization (CEN), standards from ASTM International, national standards and existing definitions in the International Gas Union (IGU) Dictionary of the Gas Industry.

Terms used in the field of gas analysis that are well defined by either ISO/IEC Guide 98-3 or ISO/IEC Guide 99 are included in Annex A.

1 Scope

This document establishes the terms and definitions that are used in the field of natural gas, natural gas substitutes, mixtures of natural gas with gaseous fuels (such as unconventional and renewable gases) and wet gas.

2 Normative references

3 Terms and definitions

3.1 Terms related to gas composition and properties

3.2 Terms related to sampling and measurement techniques

3.3 Terms related to analytical and calibration methods

3.4 Terms related to equipment and instrumentation

3.5 Terms related to thermodynamic and phase behaviour

3.6 Terms related to odorization and safety

3.7 Terms related to operational and process conditions

3.8 Terms related to gas chromatography

3.9 Miscellaneous terms

Bibliography

ISO 14532:2026

Natural gas. Vocabulary

Current

Published:

10 Aug 2026

1 Scope