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Holy moley! The amp, kelvin and kilogram will never be the same again

Charles 9 Silver badge

Here's a little food for thought. It seems one big reason they wanted to redefine the kilogram was because the different prototype kilograms were diverging from each other, and they were a little puzzled as to why: was one losing mass or the other gaining mass, and so on. That and the research into using the Kibble balance meant they could move away from prototypes.

Same for the temperature redefinition, as using the triple point basis wasn't consistent at extreme temperatures, and the Boltzmann constant was a better fit.

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