Abstract
For obvious reasons, metrology needs multiples and submultiples of physical units. To set an example, the down-scaling of the base unit mass, the kilogram, is considered.
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Notes
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In point of fact a whole series of copies was fabricated in one go. These prototypes, each one of nominal value 1Â kg (exact), are cylinders 39Â mm in height and 39Â mm in diameter and consist of an alloy of 90Â % platinum and 10Â % iridium. At present, a new definition of the SI unit kg is under investigation.
References
Journals
T.J. Quinn, The kilogram: the present state of our knowledge. IEEE Trans. Instrum. Meas. 40, 81–85 (1991)
Works by the Author
M. Grabe, Masseanschluß und Fehlerausbreitung. PTB-Mitt. 87, 223–227 (1977)
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Grabe, M. (2014). Calibration Chains. In: Measurement Uncertainties in Science and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-04888-8_20
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DOI: https://doi.org/10.1007/978-3-319-04888-8_20
Publisher Name: Springer, Cham
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