Continuing to maintain such an important measure as the “kilogram” based on a single item (the “Big K“) was considered to be very dangerous in case the item could be stolen. More importantly, the mass of the “Big K” had been determined to have changed since 1889 (One kilogram in 1889 weighed more than one kilogram today).
In fact, the kilogram is such an important unit of measurement in the scientific method, that it helps to define other units of the “International System” as: The mole, the candela, and the Ampere (this in turn is related to other units such as Newtons, Joules, Volts and Watts)
An important piece of information regarding the alteration of the mass of the “Grand K” is that it affects not only the definition of the kilogram. The current definition of the pound is that one pound is equal to 0.453592 kilograms. Therefore, since there is a direct relationship between the kilogram and the pound, it is necessary to have the most accurate and universal measurement of the kilogram.
To take the new measurement of the kilogram, the “Planck constant” was taken as a reference, named in this way after its discoverer, the German mathematician and physicist Max Planck.
Planck’s constant was initially proposed as the constant of proportionality between the energy of a photon and the frequency of its associated electromagnetic wave.
In May 20, 2019, the kilogram is defined as the fixed numerical value of Planck’s constant “h” how 6.62607015 e-34 expressed in kg · m2 · s-1. The present constant will make it possible to define the kilogram through a “power balance” used in the study of quantum physics and not through the “Grand Kilo” which continues to be a reference for the definition of the kilogram although in a secondary way.