SIST EN ISO 80000-9:2019/A1:2025

Quantities and units - Part 9: Physical chemistry and molecular physics - Amendment 1 (ISO 80000-9:2019/Amd1:2025)

Größen und Einheiten - Teil 9: Physikalische Chemie und Molekularphysik -Änderung 1 (ISO 80000-9:2019/Amd1:2025)

Grandeurs et unités - Partie 9: Chimie physique et physique moléculaire - Amendement 1 (ISO 80000-9:2019/Amd1:2025)

Veličine in enote - 9. del: Fizikalna kemija in molekulska fizika - Dopolnilo 1 (ISO 80000-9:2019/Amd1:2025)

General Information

• Status: Published
• Public Enquiry End Date: 29-Oct-2024
• Publication Date: 30-Sep-2025
• ICS: 01.060 - Quantities and units
• ICS: 07.030 - Physics. Chemistry
• Technical Committee: TRS - Technical drawings, quantities, units, symbols and graphical symbols
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Aug-2025
• Due Date: 25-Oct-2025
• Completion Date: 01-Oct-2025
• Ref Project: EN ISO 80000-9:2019/A1:2025 - Quantities and units - Part 9: Physical chemistry and molecular physics - Amendment 1 (ISO 80000-9:2019/Amd 1:2025)

Relations

• Amends: SIST EN ISO 80000-9:2019 - Quantities and units - Part 9: Physical chemistry and molecular physics (ISO 80000-9:2019)
• Effective Date: 01-Nov-2025

Overview

EN ISO 80000-9:2019/A1:2025 is Amendment 1 to Part 9 of the ISO 80000 series: Quantities and units - Physical chemistry and molecular physics. Prepared by ISO/TC 12 in collaboration with IEC/TC 25 and CEN, this amendment was approved by CEN and published in 2025. It modifies the European Standard EN ISO 80000-9:2019 without technical change and is intended for national adoption by March 2026.

Key editorial changes in the amendment include an update to the Normative references (Clause 2) to cite the BIPM "The International System of Units (SI), 9th edition (2019)" and a revision to Terms and definitions (Clause 3) clarifying that names, symbols, definitions and units are given in Table 1 and in the SI. The document notes general implementation considerations, including potential patent issues and the role of national standards bodies for feedback and queries.

Key Topics

• Standard reference: EN ISO 80000-9:2019/A1:2025 (Amendment 1)
• Primary focus: Names, symbols and SI units used in physical chemistry and molecular physics
• Clause updates: Addition of a normative SI reference (BIPM SI, 9th ed., 2019) and modification of Clause 3 wording to reference Table 1 and the SI
• Adoption timeline: To be adopted as national standard (identical or endorsed) by CEN members by March 2026
• Languages & status: Official English, French and German versions; translations by CEN members are permitted
• Scope note: Scope information not provided (N/A) in the extract

Applications

This amendment has practical value across scientific, technical and regulatory contexts where consistent use of quantities and units is essential:

• Laboratory reporting and data exchange in physical chemistry and molecular physics
• Instrument calibration and metrology, where adherence to the SI supports traceability
• Scientific publications and educational materials to ensure uniform symbols and units
• Software, databases and modelling tools that encode or present physical-chemistry data
• Cross-border standardization and procurement in industry sectors relying on consistent units

Adoption of the amendment supports interoperability, reduces ambiguity in measurements and helps align national standards with the international SI framework.

Related Standards

• ISO 80000 series (other parts covering quantities and units)
• EN ISO 80000-9:2019 (base document amended by A1)
• BIPM: The International System of Units (SI), 9th edition (2019)
• ISO/IEC Directives (editorial and development procedures)

For implementation questions or national adoption details, contact your national standards body or consult the CEN-CENELEC Management Centre. Feedback is handled through the user’s national committee as indicated in the amendment.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2025
Veličine in enote - 9. del: Fizikalna kemija in molekulska fizika - Dopolnilo 1 (ISO
80000-9:2019/Amd1:2025)
Quantities and units - Part 9: Physical chemistry and molecular physics - Amendment 1
(ISO 80000-9:2019/Amd1:2025)
Größen und Einheiten - Teil 9: Physikalische Chemie und Molekularphysik -Änderung 1
(ISO 80000-9:2019/Amd1:2025)
Grandeurs et unités - Partie 9: Chimie physique et physique moléculaire - Amendement
1 (ISO 80000-9:2019/Amd1:2025)
Ta slovenski standard je istoveten z: EN ISO 80000-9:2019/A1:2025
ICS:
01.060 Veličine in enote Quantities and units
07.030 Fizika. Kemija Physics. Chemistry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 80000-9:2019/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 01.060
English Version
Quantities and units - Part 9: Physical chemistry and
molecular physics - Amendment 1 (ISO 80000-
9:2019/Amd 1:2025)
Grandeurs et unités - Partie 9: Chimie physique et Größen und Einheiten - Teil 9: Physikalische Chemie
physique moléculaire - Amendement 1 (ISO 80000- und Molekularphysik - Änderung 1 (ISO 80000-
9:2019/Amd 1:2025) 9:2019/Amd 1:2025)
This amendment A1 modifies the European Standard EN ISO 80000-9:2019; it was approved by CEN on 5 December 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 80000-9:2019/A1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 80000-9:2019/A1:2025) has been prepared by Technical Committee ISO/TC 12
"Quantities and units" in collaboration with CCMC.
This Amendment to the European Standard EN ISO 80000-9:2019 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by March 2026, and
conflicting national standards shall be withdrawn at the latest by March 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 80000-9:2019/Amd 1:2025 has been approved by CEN as EN ISO 80000-
9:2019/A1:2025 without any modification.
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