SI Units and Derived Units
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The International System of Units (SI, abbreviated from the French Système international ) is the modern form of the metric system, and is the most widely used system of measurement.
- A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.
- It comprises a coherent system of units of measurement built on seven base units (ampere, kelvin, second, metre, kilogram, candela, mole) and a set of twenty decimal prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units.
- The system also specifies names for 22 derived units for other common physical quantities like lumen, watt, etc.
- The SI base units are the building blocks of the system and all the other units are derived from them. When Maxwell first introduced the concept of a coherent system, he identified three quantities that could be used as base units: mass, length and time.
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SI Derived units
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