THIS DAY IN SCIENCE: 1st Controlled Powered Flight in 1852

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The kg is dead, long live the kg – by Veritasium

The kilogram, mole, kelvin, and ampere will be redefined by physical constants. 

Will this be the last video I make about SI units? Quite possibly. There’s something about being so precise and defining the systems within which science works. When we can more accurately and routinely measure a kilogram, a mole, a kelvin and an ampere, then we can make better observations, we can better detect anomalies and improve our theories. That is why this is so important to me.

 

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