Watt Balance
نویسندگان
چکیده
منابع مشابه
The new METAS Watt Balance, Mark II
In the context of the future new definition of the mass unit, kg, a promising route to link the mass unit to a fundamental constant, the Planck constant h, is represented by the watt balance experiment. Since a number of years, the Federal Institute of Metrology is active in this field and published a first result with its Mark I experiment in 2011. To reach the target uncertainty of 2 parts in...
متن کاملThe New Watt Balance Experiment at Metas
The kilogram is the last unit of the international system (SI) still based on a material artifact, the international prototype of the kilogram (IPK). The comparisons made in the last hundred years have clearly revealed a long term relative drift between the IPK and a set of copies kept under similar conditions. Since the long term stability is one of the major conditions set on the SI base unit...
متن کاملDetermination of the Planck constant with the METAS watt balance
The METAS watt balance project was initiated slightly more than a decade ago. Over this time, the apparatus has been through an uninterrupted series of upgrades that have improved its reliability to a point where continuous series of measurements can be taken fully automatically over periods of several months. A comprehensive analysis of possible systematic errors has now been completed and a l...
متن کاملDesign of the new METAS watt balance experiment Mark II
The kilogram is the last unit of the international system of units (SI) still based on a material artefact, the international prototype of the kilogram (IPK). The comparisons made in the last hundred years have clearly revealed a long-term relative drift between the IPK and the official copies kept under similar conditions at the Bureau International des Poids et Mesures. A promising route towa...
متن کاملFabrication of the Magnetic Circuit for the Bipm Watt Balance
INTRODUCTION Since 1889 the International Prototype of the Kilogram, kept at the BIPM, had served as the definition of the unit of mass in the International System of Units (SI). It is the last material artefact to define a base unit of the SI, and it influences several other base units. This situation is no longer adequate in a time of ever increasing measurement precision. It is therefore pla...
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ژورنال
عنوان ژورنال: Open Schools Journal for Open Science
سال: 2020
ISSN: 2623-3606
DOI: 10.12681/osj.22362