Explore the new International System of Units in this 43-minute colloquium by Diederik Wiersma, President of the Italian Metrology Institute. Discover how the 2018 SI system defines base units using fixed natural constants, its historical context, and its impact on future technological advancements. Learn about the importance of measurement technologies for society, industry, and scientific progress. Gain insights into the future of measurement science in our increasingly digital world. This talk, part of the PHYSICS MATTERS Colloquia series, offers a comprehensive look at the evolution and significance of metrology in modern science and technology.