The International System of Units (abbreviated SI from French: Le Système international d’unités) is the modern form of the metric system and is the world’s most widely used system of measurement, used in both everyday commerce and science. It comprises a coherent system of units of measurement built around seven base units, 22 named and an indeterminate number of unnamed coherent derived units, and a set of prefixes that act as decimal-based multipliers.
The fantastic International System of Units
