Scope
Names, symbols, definitions, and units for quantities of space and time — the foundational dimensions of the ISQ. Covers length, area, volume, angle, curvature, duration, frequency, velocity, acceleration, and related quantities.
What You'll Find
1
Defines base quantities length and time, along with their derived quantities
2
Covers both plane and solid angles, including the radian and steradian as units of dimension one
3
Includes conversion factors between common units (e.g., degree to radian, km/h to m/s)
4
Second edition simplifies the table and makes definitions more physically precise
Obtain the Standard
Published by the International Organization for Standardization (ISO). Edition 2019 (2nd). Developed by ISO/TC 12 — Quantities and units.
Browse Entries
42 quantities defined in Part 3