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6 q&more articles about the topic international system of unitsrss
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Metrological traceability: central concept of metrology and requirement of accreditation standards worldwide
Metrological traceability is necessary for consistent, comparable and valid measurement values. As a fundamental concept of modern-day metrology, it allows measurement results to be internationally recognized and is required by norms and accreditation standards all over the world. The ...
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.
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 ...
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 ...
From the FDA to ISO, from Pharmaceuticals to Food – Measurements using Reference Materials
Reference materials have become indispensable as important points of reference in analytical chemistry. There exists a wide range of the most varied materials due to a multitude of institutions, policies, users and applications. In pharmaceutical analysis, these materials – often called standards ...
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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