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Kelvin Redefined with the Help of Mahr Form Measurement System

Redefining the kelvin so that it is linked to an exact numerical value of the Boltzmann constant k

Mahr Inc.
Wed, 03/07/2012 - 12:25
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(Mahr Federal: Providence, RI) -- In conjunction with the General Conference on Weights and Measures (CGPM), the kelvin, the basic unit of thermodynamic temperature, is currently being newly defined at the Physikalisch-Technischen Bundesanstalt (PTB) in Braunschweig, Germany, which is the counterpart of NIST in the United States. The goal of PTB’s portion of the program is a precise determination of the Boltzmann constant k, the conversion factor between thermal and mechanical energy. The project is being done with the help of a highly accurate reference formtester from Mahr, the MarForm MFU 110 WP, which includes both tactile and optical sensors, and provides accuracy into the nanometer range.

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In October of 2011, the CGPM adopted a plan to redefine four of the seven base units of the International System of Units (SI) in terms of the invariants of nature—the fundamental physical constants or properties of atoms. A previous example of this was the redefinition of the meter in 1983, which links it to an exact value of the speed of light in a vacuum. The CGPM recommended that efforts be made by the various National Metrology Institutes to reduce the uncertainties of these constants.

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