SI Units | NIST
https://www.nist.gov/pml/weights-and-measures/metric-si/si-units
Dec 06, 2021 · The SI rests on a foundation of seven (7) defining constants: the cesium hyperfine splitting frequency, the speed of light in vacuum, the Planck constant, the elementary charge (i.e. the charge on a proton), the Boltzmann constant, the Avogadro constant, and the luminous efficacy of a specified monochromatic source.Definitions of all seven (7) SI base units are expressed using an …
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