EN ISO 80000-3:2020/A1:2025 PDF

Overview

EN ISO 80000-3:2020/A1:2025 is Amendment 1 to Part 3 of the ISO 80000 series, Quantities and units - Space and time. Published as a CEN-endorsed amendment in 2025, it updates terminology, notations and normative references used to express physical quantities and units related to space and time. The amendment aligns Part 3 with the International System of Quantities (ISQ) and the International System of Units (SI) where applicable and clarifies several mathematical expressions in the standard’s tables.