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2 q&more articles about the topic natural constants

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Natural constants take center stage

A fundamental change in the International System of Units

The 20th of May 2019 is a special day. From that day on, the old definitions of what a kilogram, a mole, an ampere and a kelvin represent, are history. The future of the International System of Units will see natural constants play the star roles.

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How the Avogadro constant was measured for the last time

Determining the basis for the redefinition of the units kilogram and mole

Since the 20th of May 2019, the mass unit kilogram is no longer defined by the international kilogram prototype but by the numerical value of the Planck constant, the most important fundamental constant in quantum physics. For this definition, the Planck constant needed to be measured with the ...

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