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In addition to Ampere, Kelvin, Mol and Co., the kilogram also is now defined by a natural constant. In concrete terms, this means that the original kilogram, which has been the measure of all things for 130 years, has now served its purpose in Paris. This is made possible by the single crystals grow more
If you come across someone who can tell you by heart and without cheating what a kilogram is after 20 May 2019, beware! It is probably a particular kind of scientist, a metrologist, who is still overly enthusiastic about the fundamental change experienced by the International System of Units, the SI more
Understanding the dynamics of quantum-mechanical systems on their natural time scale is the main goal in attosecond science. Among the most interesting systems to investigate are molecules, which have a very high degree of complexity, in particular when compared to atomic systems. So far, the few at more
During the last several years, Mettler-Toledo has been privileged to participate in several strategic partnerships that have contributed to the newly established and highly stable kilogram definition. This video explains the background of the 1 kg redefinition and the effect this change will hav ... more
A new definition of the kilogram was necessary, in order to ensure the measurement unit is independent from a physical object. more
Entropy, Vol. 20, Pages 494: SIP-Based Single Neuron Stochastic Predictive Control for Non-Gaussian Networked Control Systems with Uncertain Metrology Delays Entropy doi: 10.3390/e20070494 Authors: Xinying Xu Yalan Zhao Mifeng Ren Lan Cheng Mingyue Gong In this paper, a novel more
Attosecond metrology of atoms has accessed the time scale of the most fundamental processes in quantum mechanics. Transferring the time-resolved photoelectric effect from atoms to molecules considerably increases experimental and theoretical challenges. Here we show that orientation- and energy-res more
Sensors, Vol. 18, Pages 1734: Reader Architectures for Wireless Surface Acoustic Wave Sensors Sensors doi: 10.3390/s18061734 Authors: Fabian Lurz Thomas Ostertag Benedict Scheiner Robert Weigel Alexander Koelpin Wireless surface acoustic wave (SAW) sensors have some unique fea more
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 the Watt balance experiment for determination of Planck‘s constant h and the Avogadro experiment for determining the Avogadro Constant NA. more
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. more
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 “International Prototype of the Kilogram” (IPK). more
Christian Müller-Schöll, born in 1966, studied mechanical engineering at the University of Stuttgart, Germany, and graduated as Diploma-Engineer. At the ZHAW Zurich University of Applied Sciences he obtained a certificate for Integrated Risk Management. He headed the primary mass calibration laborat more
Joachim Ullrich, born in 1956, studied geophysics and physics at the University of Frankfurt where, after graduating in 1983, he also completed his doctorate in 1987 and qualified as a professor in 1994. From 1989 to 1997 he worked as a research assistant at the Gesellschaft für Schwerionenforschung more
Klaus Fritsch is Manager Compliance of the Global Business Area “Laboratory Weighing” within Mettler-Toledo. He has been with Mettler-Toledo since 2005, acting as senior metrologist and consulting the industry to achieve compliance with applicable regulations when using weighing instruments. He rece more
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