Redefined units of Kilogram, Kelvin, Mole and Ampere

(Ministry of Science & Technology)

WHAT

After decades of ground-breaking laboratory works, the world’s scientific and technical community, in a landmark and historic decision taken in the recent open session of the General Conference on Weights and Measures (CGPM) at BIPM on 16 November 2018, has unanimously adopted the resolution to redefine four of the seven base units, the kilogram (SI unit of weight), Kelvin (SI unit of temperature), mole (SI unit of amount of substance), and ampere (SI unit of current).

• This decision has now enabled scientists and researchers to base the SI units entirely on fundamental properties of nature, which will ensure their ongoing refinement and improvement for years to come.
• The fundamental constants are invariants of time and space and successfully replaced the artifact based units, and aptly opened up the new era for quantum world by linking all seven base units to fundamental constants/quantum standards.
• The new SI is being implemented worldwide from 20th May 2019 i.e. the World Metrology Day.
• The World Metrology Day (WMD) is celebrated annually on this very day as the Metre Convention was signed by representatives of seventeen nations on May 20, 1875. The Convention set the framework for global collaboration in the science of measurement and in its industrial, commercial and societal applications.
• The whole metrology world, especially the National Metrology Institutes (NMIs) are celebrating this year’s WMD as mark for the new beginning of metrology, based on constant of nature on a large scale.

Source: PIB

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