English | 2022 | ISBN: 9783658352462 | 51 pages | True PDF EPUB | 7.07 MB
In May 2019, the new SI definitions for ampere, kilogram, kelvin and mole came into force. For the mole, the SI unit of the amount of substance, the Avogadro constant was newly determined and its value set as the defining constant. But: How did it come about that a comparative number became a natural constant? Embark on a short journey from the beginning to today: from the gas laws of the 17th century to the new SI system of units of the 21st century. Learn about the importance of natural constants in general and the Avogadro constant in particular. Get an overview of the term "mole" and learn which (exemplary) methods can be used to determine the Avogadro constant. Finally, get an overview of the history of the SI system of units and the new definitions of SI units.