Amendment 1 - Quantities and units - Part 5: Thermodynamics
Amendment 1 - Quantities and units - Part 5: Thermodynamics
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ISO 80000-5:2019/AMD1:2025 is the first amendment to the second edition of ISO 80000-5, which covers quantities and units related to thermodynamics. Developed collaboratively by ISO Technical Committee ISO/TC 12 and IEC Technical Committee IEC/TC 25, this amendment updates definitions, symbols, and units to align with the latest international standards. Published by the International Organization for Standardization (ISO), it integrates key updates from the International System of Units (SI) as defined by the Bureau International des Poids et Mesures (BIPM).
This amendment is essential for maintaining consistency in thermodynamics measurement across scientific research, engineering, and industrial applications. It supports precision and clarity in the use of thermodynamic quantities, ensuring global interoperability in communication and documentation.
Updated Normative References The amendment introduces normative references to the International System of Units (SI), specifically the 9th edition published in 2019 by BIPM. This inclusion mandates compliance to the most current SI standards for thermodynamic quantities.
Revised Terms and Definitions The document modifies terminology to clarify the names, symbols, and definitions of thermodynamic quantities. It provides a revised Table 1 enumerating these quantities consistent with SI units, reinforcing uniformity in scientific and engineering contexts.
Quantities and Symbols It standardizes the symbols used to represent thermodynamic variables such as temperature, entropy, enthalpy, and internal energy, providing clear conventions to avoid ambiguity in global communication.
Units in Thermodynamics Emphasizes adherence to SI units such as Kelvin for temperature, joules for energy, and pascals for pressure. This ensures harmonization with international measurement systems and facilitates worldwide data exchange and comparison.
Scientific Research and Academia Provides a fundamental reference for researchers in physics, chemistry, and engineering disciplines dealing with thermodynamic measurements and calculations.
Engineering Design and Simulation Enables engineers to apply internationally recognized quantities and units in system modeling, thermal analysis, and energy efficiency evaluations.
Industrial and Manufacturing Processes Supports industries involved in thermal management, energy production, and materials science by standardizing measurement protocols and reporting formats.
Metrology and Calibration Laboratories Assists calibration professionals in aligning measurement instruments with recognized standards to ensure accuracy and traceability.
ISO 80000 Series ISO 80000-5:2019/AMD1 is part of the broader ISO 80000 series, which covers quantities and units across various scientific and technical domains including mechanics, acoustics, and electromagnetism.
BIPM SI Brochure (9th Edition, 2019) The International System of Units brochure guides the fundamental units which are referenced throughout this amendment.
IEC/TC 25 Standards Since IEC collaborates on quantities and units, related electrotechnical standards align closely with ISO 80000-5 amendments.
ISO/IEC Directives Part 1 and Part 2 Procedures and editorial rules underpinning the development and maintenance of ISO documents referenced for this amendment.
Keywords: ISO 80000-5:2019/AMD1:2025, thermodynamics quantities, SI units, thermodynamic symbols, international standards, thermal measurements, scientific standards, IEC collaboration, ISO standards, metrology, energy unit standardization.
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