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International System of Units (SI)

Return to International System of Units, IEC 80000-13 - ISO/IEC 80000, Binary prefixes: kilo-mega-giga-tera-peta-exa-zetta-yotta

Overview

The International System of Units (SI) is the global standard for measurement, established to provide a consistent and uniform system for scientific, commercial, and everyday use. It was adopted in 1960 by the General Conference on Weights and Measures (CGPM) and is maintained by the International Bureau of Weights and Measures (BIPM). The SI system is based on the metric system and includes a set of base units, derived units, and prefixes.

Base Units

The SI system consists of seven base units from which other units are derived. These base units are:

Derived Units and Prefixes

Derived units are combinations of base units used to measure more complex quantities. Examples include the Newton (N) for force, which is derived from kg·m/s², and the Joule (J) for energy. The SI system also employs prefixes to denote multiples or submultiples of units, such as:

These prefixes facilitate easier expression of measurements.

Global Adoption and Use

The SI system is used worldwide, providing a common language for measurements in science, industry, and commerce. Its adoption helps ensure accuracy and consistency in international trade, scientific research, and engineering. While some countries use non-SI units for certain applications (e.g., miles in the United States), the SI system remains the international standard for most measurements.


International System of Units

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