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

• Referred By: SIST EN 60862-1:2016 - Surface acoustic wave (SAW) filters of assessed quality - Part 1: Generic specification
• Effective Date: 09-Feb-2026
• Referred By: SIST EN IEC 61293:2020 - Marking of electrical equipment with ratings related to electrical supply - Safety requirements (IEC 61293:2019)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN IEC 60122-4:2019 - Quartz crystal units of assessed quality - Part 4: Crystal units with thermistors (IEC 60122-4:2019)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60115-1:2023 - Fixed resistors for use in electronic equipment - Part 1: Generic specification (IEC 60115-1:2020 (MOD)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 61082-1:2015 - Preparation of documents used in electrotechnology - Part 1: Rules (IEC 61082-1:2014)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 62604-1:2015 - Surface acoustic wave (SAW) and bulk acoustic wave (BAW) duplexers of assessed quality - Part 1: Generic specification
• Effective Date: 09-Feb-2026
• Referred By: SIST EN IEC 62604-1:2022 - Surface acoustic wave (SAW) and bulk acoustic wave (BAW) duplexers of assessed quality - Part 1: Generic specification (IEC 62604-1:2022)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 16263-5:2015 - Pyrotechnic articles - Other pyrotechnic articles - Part 5: Minimum labelling and end users documentation
• Effective Date: 28-Jan-2026
• 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, published by CEN, is an amendment to the internationally recognized standard defining quantities and units in thermodynamics. Part of the comprehensive ISO 80000 series, this amendment aligns the standard with updates to the International System of Units (SI) and clarifies key definitions. As thermodynamics is fundamental in physics, engineering, chemistry, and related fields, precise definitions and standardized units are crucial for international collaboration, research integrity, and consistency in technical documentation.

The amendment, referenced as ISO 80000-5:2019/Amd1:2025, is required to be adopted by all CEN member countries, ensuring uniformity across Europe in the representation and application of thermodynamic quantities and units.

Key Topics

• Update to Normative References:
  The amendment introduces updated references to essential source documents, aligning with the 9th edition of the "BIPM The International System of Units (SI), 2019." This ensures that practitioners are using the most current standards for SI units.

• Clarified Definitions and Units:
  It modifies the section on terms and definitions, emphasizing the use of Table 1 and the SI for thermodynamic quantities. This update helps eliminate ambiguities, providing unambiguous names, symbols, and units for use in scientific communication.

• Harmonization Across Countries:
  By mandating adoption and withdrawal of conflicting national standards by February 2026, the amendment ensures cohesive implementation and cross-border compatibility.

• European and International Scope:
  The standard is enforced as both a European and an international standard, promoting global interoperability in scientific and engineering applications.

Applications

The standardized approach to thermodynamic quantities and units provided by SIST EN ISO 80000-5:2019/A1:2025 is essential across various sectors, including:

• Scientific Research:
  Ensures reproducibility and clarity in thermodynamic experiments and publications by standardizing units of measurement.
• Engineering and Industrial Processes:
  Enables accurate specification, design, and validation of systems that involve heat transfer, energy conversion, and thermodynamic analysis.
• Education:
  Facilitates coherent curriculum development and textbook content, supporting students' understanding of thermodynamics using globally recognized units and definitions.
• International Trade and Regulation:
  Eases compliance and product certification by harmonizing technical documentation and labeling requirements across countries.

Related Standards

• ISO 80000 Series:
  EN ISO 80000-5 is part of the broader ISO 80000 series, which covers quantities and units in various scientific and technical disciplines, from mathematics and physics to chemistry and engineering.

• The International System of Units (SI):
  Referenced directly in this amendment, the SI (BIPM, 9th edition, 2019) is the global foundation for all measurement standards.

• IEC/TC 25 Standards:
  IEC standards associated with quantities and units collaborate closely with ISO 80000 to ensure cross-disciplinary consistency.

• National Implementations:
  All CEN member countries adopt this amendment as their national standard, withdrawing any conflicting standards, which ensures uniformity across European countries.

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Keywords: SIST EN ISO 80000-5:2019/A1:2025, thermodynamics, quantities and units, SI units, international standard, CEN, ISO 80000 series, engineering, scientific measurement, harmonization, technical documentation, amendment 1, standardization.

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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