How much does a kilogram weigh?

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By Danny Sullivan

Since secondary school physics, I have always been intrigued by the idea of Le Grand K, the original prototype cylinder of platinum that accurately represents a mass of 1kg, which is still used. Surely such an item is simply a historical relic and is largely unimportant in the grand scheme of modern science. But it appears that this is not the case…

The BBC reports on the fact that Le Grand K’s mass is actually changing over time and that scientists are searching for a new way to define the kilogram.

Baffling stuff, to be sure, but I’ve always found it a little worrying to think that world science depends so heavily on one little lump of metal.

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