Base Unit
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Definition
A fundamental unit from which other units in a system are derived.
Explanation
In SI, the seven base units are independent quantities. Derived units like newton (kg·m/s²) are combinations of base units.
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Meter
The SI base unit of length, defined as the distance light travels in 1/299,792,458 of a second.
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The SI base unit of mass, defined by the Planck constant.
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The SI base unit of time, defined by the cesium-133 atom.
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The SI base unit of temperature, starting at absolute zero.
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The SI base unit of electric current.