EN ISO 80000-11:2020/A1:2025
(Amendment)Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-11:2019/Amd 1:2025)
Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-11:2019/Amd 1:2025)
Größen und Einheiten - Teil 11: Kenngrößen der Dimension Zahl - Änderung 1 (ISO 80000-11:2019/Amd 1:2025)
Grandeurs et unités - Partie 11: Nombres caractéristiques - Amendement 1 (ISO 80000-11:2019/Amd 1:2025)
Veličine in enote - 11. del: Značilna števila - Dopolnilo A1 (ISO 80000-11:2019/Amd 1:2025)
General Information
Relations
Overview
EN ISO 80000-11:2020/A1:2025, titled Quantities and Units - Part 11: Characteristic Numbers - Amendment 1, is an important update to the international standard ISO 80000-11:2019. Prepared by the International Organization for Standardization (ISO) Technical Committee ISO/TC 12 in collaboration with CEN, this amendment refines the framework for defining and using characteristic numbers in science and engineering. Officially approved by the European Committee for Standardization (CEN) in December 2024, this amendment is set for implementation across CEN member states by February 2026.
The standard aligns with the International System of Units (SI), ensuring global consistency in the use and understanding of characteristic quantities and units. It addresses updates to normative references and clarifies key definitions related to characteristic numbers, which are dimensionless quantities fundamental in fields such as physics, engineering, and metrology.
Key Topics
- Characteristic Numbers: Dimensionless quantities that express relationships between physical quantities without units, crucial in analyzing system behaviors and properties.
- Normative References Update: Incorporates the latest editions of referenced standards, including the 9th edition of the BIPM International System of Units (SI) from 2019.
- Terms and Definitions: Clarifies and updates the terminology, ensuring consistency with SI units and referencing key tables that list names, symbols, and units for characteristic numbers.
- Harmonization with SI Units: Emphasizes alignment with the SI to maintain coherence in measurements and calculations worldwide.
- Implementation Requirements: Details obligations for national standard bodies within CEN member countries to adopt the amendment without alterations, supporting uniform application.
Applications
EN ISO 80000-11:2020/A1:2025 serves as a foundational reference for professionals and organizations involved in measurement science, instrumentation, and industrial processes that rely on precise quantification of characteristic numbers. Its practical applications include:
- Metrology Laboratories: Standardizing measurement methods and ensuring traceability to SI units.
- Engineering Design: Applying characteristic numbers in dimensional analysis to optimize systems and materials.
- Scientific Research: Facilitating clear communication of experimental data involving dimensionless parameters.
- Quality Assurance: Supporting compliance with international measurement standards in manufacturing and testing.
- Education and Training: Providing a unified framework for teaching quantities, units, and characteristic numbers in academic and professional settings.
Related Standards
This amendment complements the broader ISO 80000 series, which covers quantities and units across multiple parts and disciplines. Key related standards include:
- ISO 80000-1: General principles applicable across the entire series of quantities and units.
- ISO 80000-2 to -10: Cover specific categories such as mathematical signs, physical quantities related to space, time, mechanics, electricity, magnetism, thermodynamics, and light.
- The International System of Units (BIPM SI Brochure): Governs the base and derived units utilized in this amendment.
- CEN/CENELEC Internal Regulations: Governs the standardization process and ensures uniform adoption among European member states.
By standardizing characteristic numbers and their expressions within the SI framework, EN ISO 80000-11:2020/A1:2025 facilitates precise and consistent measurements crucial for science, technology, and industry. Adopting this amendment promotes interoperability, clarity, and global alignment in quantitative analysis and communication.
Frequently Asked Questions
EN ISO 80000-11:2020/A1:2025 is a amendment published by the European Committee for Standardization (CEN). Its full title is "Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-11:2019/Amd 1:2025)". This standard covers: Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-11:2019/Amd 1:2025)
Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-11:2019/Amd 1:2025)
EN ISO 80000-11:2020/A1:2025 is classified under the following ICS (International Classification for Standards) categories: 01.060 - Quantities and units. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 80000-11:2020/A1:2025 has the following relationships with other standards: It is inter standard links to EN ISO 80000-11:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN ISO 80000-11:2020/A1:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2026
Veličine in enote - 11. del: Značilna števila - Dopolnilo A1 (ISO 80000-11:2019/Amd
1:2025)
Quantities and units - Part 11: Characteristic numbers - Amendment 1 (ISO 80000-
11:2019/Amd 1:2025)
Größen und Einheiten - Teil 11: Kenngrößen der Dimension Zahl - Änderung 1 (ISO
80000-11:2019/Amd 1:2025)
Grandeurs et unités - Partie 11: Nombres caractéristiques - Amendement 1 (ISO 80000-
11:2019/Amd 1:2025)
Ta slovenski standard je istoveten z: EN ISO 80000-11:2020/A1:2025
ICS:
01.060 Veličine in enote Quantities and units
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 80000-
EUROPEAN STANDARD
11:2020/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2025
ICS 01.060
English Version
Quantities and units - Part 11: Characteristic numbers -
Amendment 1 (ISO 80000-11:2019/Amd 1:2025)
Grandeurs et unités - Partie 11: Nombres Größen und Einheiten - Teil 11: Kenngrößen der
caractéristiques - Amendement 1 (ISO 80000- Dimension Zahl - Änderung 1 (ISO 80000-
11:2019/Amd 1:2025) 11:2019/Amd 1:2025)
This amendment A1 modifies the European Standard EN ISO 80000-11:2020; 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 80000-11:2020/A1:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 80000-11:2020/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 80000-11:2020 shall be given the status of a
national standard, either by publication of an identical text or by endorsement, at the latest by February
2026, and conflicting national standards shall be withdrawn at the latest by February 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 80000-11:2019/Amd 1:2025 has been approved by CEN as EN ISO 80000-
11:2020/A1:2025 without any modification.
SIST EN ISO 80000-11:2020/A1:2
...
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