SI Unit System (International System of Units)

The International System of Units (SI) is the modern form of the metric system and is the most widely used system of measurement worldwide. The system is based on a set of base units from which other units are derived.

Seven Base SI Units:

1. Meter (m) for length
2. Kilogram (kg) for mass
3. Second (s) for time
4. Ampere (A) for electric current
5. Kelvin (K) for temperature
6. Mole (mol) for the amount of substance
7. Candela (cd) for luminous intensity

Other units like joules, newtons, watts, and pascals are derived from these base units