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Metrology Symposium 2020

(10 January 2020)

The Council, Government Laboratory, the Open University of Hong Kong and the Standards and Calibration Laboratory (SCL) of Innovation and Technology Commission co-organised the Metrology Symposium 2020. (Programme)

The International System of Units made a major revision of the SI, the foundation of measurements on May 20, 2019. The seven base units, namely, second, metre, kilogram, ampere, kelvin, mole and candela were redefined based on the fundamental constants related to the fundamental laws of nature. The re-definition removes the instability imposed by the use of artefact standards and makes these SI base units “fundamentally better”.

The revision of the SI enables the base units to be realized with accuracies limited only by the physical nature and our technical capability but not by their definitions. In recent year many innovative primary methods have been developed or refined for the practical realization of the base units using the law of physics. There were also numerous advances in the field of reference material and the metrology of chemistry and biology. The Symposium attempted to unfold to the local testing and certification industry as well as the parties interested in metrology how the revised SI will enable us to enhance the accuracy in measurement science and technology. Advance topics in the latest research and development related to the primary standards in various fields were also discussed.