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.