A new kilogram, why?

2021-07-02T16:10:36+02:003 June 2019|Categories: Chemistry and Physics|Tags: , , |

Finally! It was time! Only he was missing. Even the kilogram, from the 20 May, has an acceptable definition. Let me be clear: you don't have to throw away your scales. A kilo remains a kilo, but now it's more fancy. Until a few days ago, what was a kilogram? It was The Mass (mass, not the weight, remember, They are different) of a particular Platinum-Iridium cylinder deposited at the International Bureau of Weights and Measures in France. The matter that surrounds us, however, has the bad habit of changing: some molecules can detach, it can simply oxidize, change shape thanks to some cosmic ray. Small variations of which, of [...]