Improved measurement results for the Avogadro constant using a28Si-enriched crystal
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چکیده
منابع مشابه
Avogadro and his Constant
Avogadro’s constant is the number of molecules in a mole, or the ratio of the molar mass to the molecular mass. Its great importance is that it provides a link between the properties of individual atoms or molecules and the properties of bulk matter. For example, it links the energies of individual atoms and molecules, which can be determined from spectroscopy, to the thermodynamic energies of ...
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Today the mass unit kilogram is still defined by the mass of an artefact, the international prototype of the kilogram. The Avogadro constant can be used to define the kilogram in terms of a fundamental constant. The International Avogadro Coordination determined the Avogadro constant in a new approach by ‘counting’ the atoms in 1 kg single-crystal spheres, which are highly enriched with the Si ...
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The Avogadro constant, the number of entities in an amount of substance of one mole, links the atomic and the macroscopic properties of matter. Since the molar Planck constant—the product of the Planck constant and the Avogadro constant—is very well known via the measurement of the Rydberg constant, the Avogadro constant is also closely related to the Planck constant. In addition, its accurate ...
متن کاملSolution to the Avogadro constant challenge.
The Avogadro constant has long been defined as the number of molecules of a substance in a gram molecular weight [1]. In a modern parlance, it is a fundamental physical constant representing the number of entities comprising 1 mol. It is clear that any modification to the definition of macroscopic (kilogram) or microscopic mass scales (atomic mass) will affect the numerical value of the Avogadr...
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ژورنال
عنوان ژورنال: Metrologia
سال: 2015
ISSN: 0026-1394,1681-7575
DOI: 10.1088/0026-1394/52/2/360