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Le kilogramme reste la seule unité du système international dont la définition dépend d’un prototype. Cette définition va-t-elle évoluer ?
Des constructions très lourdes
Le site Passerelle(s) de la bibliothèque nationale de France invite à une exploration interactive des métiers du BTP et de quelques 70 constructions phares, représentatives de l’histoire et des techniques de leur époque.