Hi, to understand the secrets of the universe, you gotta know how to measure stuff, especially your self. Vitruvian wisdom passed down through Da vinci and others shows us we are all divine, all connected, and we couldn't exist otherwise. Seeing the connections between measures and understanding what base units are, can help us see this divinity more clearly in everything, and use that knowledge to improve the quality of our daily lives.
The International System of Units is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units, which are the second, metre, kilogram, ampere, kelvin, mole, candela, and a set of twenty 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, such as lumen and watt, for other common physical quantities.
The base units are derived from invariant constants of nature, such as the speed of light in vacuum and the charge of the electron, which can be observed and measured with great accuracy. "The SI system" Dependence of base unit definitions on physical constants with fixed numerical values and on other base units. The fundamental physical constants used to define the base units:
s - the frequency of the cesium hyperfine transition (ΔvCs) for the second
kg - the Planck constant (h) for the kilogram
mol - the Avogadro constant (NA) for the mole
cd - the sensitivity of the human eye (Kcd) for the candela,
K - the Boltzmann constant (kB) for the kelvin,
A - the elementary electric charge (e) for the ampere
m - the speed of light (c) for the metre
The "seven SI base units"
s second time
m metre length
kg kilogram mass
A ampere electric current
K kelvin temperature
mol mole amount of substance
cd candela luminous intensity
The 2019 redefinition of the SI base units came into force on 20 May 2019, the 144th anniversary of the Metre Convention.
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