Milestones in the Development of SI

Key institutional and definitional events in the evolution of the modern metric system.

The Seven SI Base Units

Each base unit, its symbol, the quantity it measures, and the constant on which its definition rests.

Named derived units, their symbols, and their expression in base units.

Selected decimal prefixes, their symbols, and their power-of-ten factors.

Jupiter Wiki · Reference Archive

Definitions, principles, formulas and concise study notes from the Zartom Glossary knowledge base.