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On May 20, 2019, this year's World Metrology Day, the changes in the definitions of the International System of Units (SI) were accepted. All the units, now, depend on the laws of nature, instead of depending on physical artefacts. The "Big Kilo" as we knew it, will no longer be the reference to the "kilo". Instead, this unit will be based on the Planck constant, as the "meter" is based on the speed of light. In the redefinition, four of the seven SI base units – the kilogram, ampere, kelvin, and mole – were redefined by setting exact numerical values for the Planck constant (h), the elementary electric charge (e), the Boltzmann constant (k), and the Avogadro constant (NA), respectively. Read more about it here:
