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Jan 7, 2013 After more than a century, the international prototype kilogram – a cylindrical chunk of metal stored in a French vault – doesn't weigh the same .Oct 5, 2018 On 16 November, scientists vote on whether to update the way we measure the kilogram. This week, Ian Sample investigates the history of the .Nov 13, 2018 The kilogram is being redefined by the International Bureau of Weights and Measures (or BIPM), but what does that mean? Instead of setting .Nov 16, 2018 The kilogram — anywhere in the world, for any purpose — is based on the exact weight of a golf-ball-sized chunk of platinum and iridium stored .Sal talks about what mass means. He also examines the masses of real objects in grams and kilograms.