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4 q&more articles about the topic planck‘s constant

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“Game over” for the Paris kilogram

The new definition of the SI base unit of mass and its significance to the weighing world

For about 200 years, any mass given in kilograms, grams and micrograms referred to a defined artifact accessible in only a single location on earth. A small metal cylinder had represented one kilogram since the metric system was introduced in France. Its successor became world famous as the ...

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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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The Best Measurement

Milestones on the path to a new definition of the kilogram

It is now more than 30 years since attempts started to find a way of defining the kilogram based on an atomic constant or a fundamental physical constant. Since then, two methods have advanced sufficiently far to make it likely that there will be a new definition within the coming years, namely ...

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