This May 20, 2019 is a historical day: the kilo, as we have known it for 130 years, ceases to exist forever. And this is because the new definition of the International System of units of measure (known as SI) for the kilogram comes into force.
It is not the only novelty: in addition to the way in which we calculate the mass, the basic unit of temperature, of the intensity of the electric current and of the substance will also be different.
From today, all these measures will be based on universal constants, which are, by definition, invariable. So that a kilo, an ampere or a kelvin are the same in a laboratory in Spain as in a scientific basis accommodated in Mars.
ABC: Desde hoy el kilo deja de ser lo que conocías hasta ahora (21/05/2019). Extraído de https://www.abc.es/ciencia/abci-desde-kilo-deja-conocias-hasta-ahora-201905200219_noticia.html#
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