Scope
Names, symbols, definitions, and units for quantities of physical chemistry and molecular physics — concentration, activity, reaction rates, transport properties, and molecular characteristics.
What You'll Find
Uses specialized subscript and notation conventions: substance symbols as subscripts, state indicators in parentheses (s, l, g), asterisk for pure substances, plimsoll sign for standard states
Covers extensive and intensive thermodynamic properties alongside kinetic and transport quantities
Includes atomic and molecular properties — atomic number, mass number, relative atomic mass, electric dipole moment
Summation conventions ensure consistency across mixture and solution chemistry
Obtain the Standard
Published by the International Organization for Standardization (ISO). Edition 2019 (2nd). Developed by ISO/TC 12 — Quantities and units.
Browse Entries
62 quantities defined in Part 9