How much does a kilogram weigh? Depends on your 'Planck constant'

Members of the BIPM, which groups some 60 nations, agreed on Friday after a week-long meeting at the nearby Palace of Versailles to redefine a kilogram in terms of a tiny but unchanging value called the "Planck constant". 

from Zee News :World https://ift.tt/2PBcOPZ

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