Another important information: starting with 2019-05-20, the definition of the kilogramm will change: it'll no longer be the mass of the internation prototype kilogramm in Paris, but instead it'll be defined in terms of the Planck constant h such that h = 6.626 070 15 × 10-34 kg·m2·s–1, with the metre defined such that the vacuum speed of light c is c = 299 792 458 m·s–1 and the second is defined as the time it takes a photon emmited by the unperturbed ground-state hyperfine transition of a caesium atom with 133 nucleons to zig and zag for 9 192 631 770 times. It will still be 0.453 592 37 –1 pounds, though.
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