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4 q&more articles of Physikalisch-Technische Bundesanstalt
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The importance of traceability in laboratory medicine
Ensuring comparability of clinical results is important in the age of globalization
World Metrology Day is celebrated annually on the 20th of May and this year’s focus on health provides an opportunity to emphasize the importance of comparable and reliable measurement results in laboratory medicine.
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 ...
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.
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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