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SI base unit
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An SI base unit is one of seven fundamental units of measurement that form the foundation of the International System of Units, which is the worldwide standard for measuring things like length, mass, time, and temperature. These seven units matter because they allow scientists, engineers, and countries around the world to communicate measurements consistently and compare results with confidence.
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The seven SI base units
The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived. The units and their physical quantities are the second for time, the metre (also spelled meter) for length or distance, the kilogram for mass, the ampere for electric current, the kelvin for thermodynamic temperature, the mole for amount of substance, and the candela for luminous intensity. The SI base units are a fundamental part of modern metrology, and thus part of the foundation of modern science and technology.