The SI changes the definitions of kilo, ampere, kelvin and mol.

On the 20th of May, came into effect the revision of the International System of Units (SI), in order to adapt to the world measurements requirements.

Since May 20th, a kilo is not the same kilo we used to know anymore. Coinciding with the World Metrology Day, the revision of the International System of Units, (SI, abbreviated from the French Système International (d’unités)) came into effect. Since then, the kilogram, the ampere, the kelvin and the mol have been redefined in relation to its numerical values, fixed from physical fundamental constants and will inherit the associated uncertainties.

Image from the Spanish Metrological Centre

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