For decades, the kilogram has been defined by a lump of metal in Paris. It鈥檚 time for a makeover, say Ian Robinson and Perdi Williams of the UK鈥檚 National Physical Laboratory.
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For decades, the kilogram has been defined by a lump of metal in Paris. It鈥檚 time for a makeover, say Ian Robinson and Perdi Williams of the UK鈥檚 National Physical Laboratory.