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Once a year, three officials bearing three separate keys meet at the bottom of a stairwell at the International Bureau of Weights and Measures, in Sèvres, France. There they unlock a vault...
New research, published by the National Physical Laboratory (NPL), takes a significant step towards changing the international definition of the kilogram – which is currently based...
“HOW much does a kilogram weigh these days?” may sound an odd question. Does a kilogram not weigh just that, a kilogram? In fact, a kilogram is the mass of a cylindrical lump...