SI Units (Metric System)
The Système International d'Unités (SI) is the modern metric system, forming the global language of science, technology, and commerce.
The 7 Base Units
Meter (m)
Length
Kilogram (kg)
Mass
Second (s)
Time
Ampere (A)
Electric Current
Kelvin (K)
Thermodynamic Temp
+ Mole & Candela
Why SI Standards Matter
In 1999, the Mars Climate Orbiter disintegrated because one engineering team used imperial units (pound-seconds) while another used metric units (newton-seconds). SI prevents catastrophic definitions errors.
Read about Calculation Precision