Scope
Names, symbols, definitions, and units for quantities of thermodynamics — temperature, heat, entropy, enthalpy, and related quantities describing thermal energy and its transformations.
What You'll Find
Defines the base quantity thermodynamic temperature and its derived quantity Celsius temperature
Covers extensive and specific thermodynamic properties — entropy, enthalpy, Gibbs energy, Helmholtz energy
Includes heat transfer coefficients, thermal conductivity, and thermal resistance
Connects to Part 4 (mechanics) through pressure-volume work and to Part 9 (chemistry) through chemical thermodynamics
Obtain the Standard
Published by the International Organization for Standardization (ISO). Edition 2019 (2nd). Developed by ISO/TC 12 — Quantities and units.
Browse Entries
54 quantities defined in Part 5