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Re-definition of Kilogram

To measure the mass (kilogram) accurately traceable to the Planck constant h, NML is adopting the technique of X-ray Crystal Density (XRCD) method and completing the establishment of new quality standards. We work with PTB, Germany to set up a mass measurement system and a combined XRF XPS system for mass determination and dissemination of the 28Si-enriched sphere. 

The implementation of the revised SI would provide quality assurance and traceability and therefore underpin the trade and hi-tech research that require world-class measurement standards.  

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  • Last Updated:2020/08/10
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