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kilogram

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”. (Photo: Pixabay)

How much does a kilogram weigh?

Since 1889, a kilogram has been defined by a shiny lump of platinum-iridium kept in a special glass case.

19 Nov 2018 9:39 AM


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