The International System of Units (SI) is a standardized system of measurement used worldwide in science, industry, and commerce. It provides a consistent framework for quantifying physical quantities, ensuring that measurements are universally understood and comparable.
The SI system is built on seven base units, from which other units (known as derived units) can be constructed. The seven base units are:
- Meter (m) - the unit of length.
- Kilogram (kg) - the unit of mass.
- Second (s) - the unit of time.
- Ampere (A) - the unit of electric current.
- Kelvin (K) - the unit of temperature.
- Mole (mol) - the unit of amount of substance.
- Candela (cd) - the unit of luminous intensity.
These base units can be combined to form derived units to measure other physical quantities, such as force (measured in newtons), pressure (measured in pascals), and energy (measured in joules).
The SI system is continually reviewed and updated by the International System of Units (SI) body, and it aims to promote uniformity and coherence in measurement practices across different scientific and engineering disciplines. In addition to the base and derived units, the SI system includes a set of prefixes (like kilo-, mega-, and milli-) that allow for easy expression of large and small quantities.
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