SIST EN ISO 80000-5:2019/A1:2025

Quantities and units - Part 5: Thermodynamics - Amendment 1 (ISO 80000-5:2019/Amd1:2025)

Größen und Einheiten - Teil 5: Thermodynamik - Änderung 1 (ISO 80000-5:2019/Amd1:2025)

Grandeurs et unités - Partie 5: Thermodynamique - Amendement 1 (ISO 80000-5:2019/Amd1:2025)

Veličine in enote - 5. del: Termodinamika - Dopolnilo 1 (ISO 80000-5:2019/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: 17.200.01 - Thermodynamics in general
• 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 80000-5:2019/A1:2025 - Quantities and units - Part 5: Thermodynamics - Amendment 1 (ISO 80000-5:2019/Amd1:2025)

Relations

• Amends: SIST EN ISO 80000-5:2019 - Quantities and units - Part 5: Thermodynamics (ISO 80000-5:2019)
• Effective Date: 01-Nov-2025

Overview

SIST EN ISO 80000-5:2019/A1:2025 is the latest amendment to the international standard concerning quantities and units in thermodynamics. Developed by the International Organization for Standardization (ISO) in collaboration with the European Committee for Standardization (CEN), this amendment updates and refines Part 5 of the ISO 80000 series. The document ensures harmonized definitions, symbols, and units associated with thermodynamic quantities, aligning them with the International System of Units (SI).

This standard is essential for consistent communication, measurement, and technical documentation across various industries and scientific disciplines where thermodynamic principles are applied. SIST EN ISO 80000-5:2019/A1:2025 supports national standards bodies across Europe and beyond, facilitating uniform standards adoption and removing conflicts between national regulations.

Key Topics

• Quantities and Units in Thermodynamics
  The standard defines and clarifies symbols and names for key thermodynamic quantities such as temperature, energy, entropy, enthalpy, and others.

• Alignment with SI Units
  This amendment emphasizes strict adherence to the International System of Units (SI), referencing the 9th edition of the BIPM SI Brochure (2019). This ensures the use of standardized units such as kelvin for temperature and joule for energy, critical for scientific accuracy and interoperability.

• Normative References
  Includes updated normative references that formally require adherence to specific editions of related documents, such as the SI Brochure, ensuring the most recent and universally accepted standards are applied.

• Terminology and Definitions Update
  The amendment revises the introductory clause on terms and definitions to clarify that names, symbols, and units are provided both in this document’s tables and the International System of Units, supporting precise terminology use.

• Patent Rights Disclosure
  The document draws attention to possible patent implications for some elements, encouraging users to exercise due diligence when implementing the standard in products or processes.

Applications

• Scientific Research and Academia
  Provides a trusted framework for thermodynamics-related measurements and data reporting in physics, chemistry, and engineering studies.

• Engineering and Industrial Processes
  Utilized in industries like HVAC, energy production, chemical manufacturing, and materials science for consistent quantification and control of thermodynamic variables.

• Standardized Communication
  Facilitates coherent exchange of technical information between companies, regulatory agencies, and international partners, reducing errors caused by inconsistent units or symbols.

• Software and Instrumentation Development
  Developers of measurement instruments and simulation software use this standard to ensure that thermodynamic quantities and their units are properly represented and computed.

• Regulatory Compliance
  National bodies enforcing harmonized standards within CEN member countries adopt this amendment to maintain updated thermodynamic measurement guidelines.

Related Standards

• ISO 80000 Series
  SIST EN ISO 80000-5:2019/A1:2025 is part 5 of the broader ISO 80000 series on quantities and units covering various scientific fields.

• BIPM International System of Units (SI), 9th Edition (2019)
  The fundamental reference defining SI units, extensively cited and integrated into this amendment.

• IEC/TC 25 – Quantities and Units
  Collaborates closely with ISO/TC 12 to maintain consistency in electrotechnical quantities and units harmonization.

• National Standards Bodies
  Adoption by member countries of CEN and national bodies like the Slovene Institute for Standardization ensures regional and national compliance with the latest scientific measurement practices.

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Adopting SIST EN ISO 80000-5:2019/A1:2025 guarantees conformity to current best practices in thermodynamic measurement and documentation. It is a vital resource for professionals aiming to maintain precision, uniformity, and legal compliance in international technical environments involving thermodynamics.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2025
Veličine in enote - 5. del: Termodinamika - Dopolnilo 1 (ISO 80000-
5:2019/Amd1:2025)
Quantities and units - Part 5: Thermodynamics - Amendment 1 (ISO 80000-
5:2019/Amd1:2025)
Größen und Einheiten - Teil 5: Thermodynamik - Änderung 1 (ISO 80000-
5:2019/Amd1:2025)
Grandeurs et unités - Partie 5: Thermodynamique - Amendement 1 (ISO 80000-
5:2019/Amd1:2025)
Ta slovenski standard je istoveten z: EN ISO 80000-5:2019/A1:2025
ICS:
01.060 Veličine in enote Quantities and units
17.200.01 Termodinamika na splošno Thermodynamics in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 80000-5:2019/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2025
EUROPÄISCHE NORM
ICS 17.200.01
English Version
Quantities and units - Part 5: Thermodynamics -
Amendment 1 (ISO 80000-5:2019/Amd 1:2025)
Grandeurs et unités - Partie 5: Thermodynamique - Größen und Einheiten - Teil 5: Thermodynamik -
Amendement 1 (ISO 80000-5:2019/Amd 1:2025) Änderung 1 (ISO 80000-5:2019/Amd 1:2025)
This amendment A1 modifies the European Standard EN ISO 80000-5:2019; 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 80000-5:2019/A1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 80000-5:2019/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 80000-5:2019 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 80000-5:2019/Amd 1:2025 has been approved by CEN as EN ISO 80000-
5:2019/A1:2025 without any modification.

SIST EN ISO 80000-5:2019/A
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