The Metric System and SI Units – Prof Richard Brown | HAPP Conference 2025

This talk was recorded at the HAPP Centre’s one-day conference, “The History of Measurement,” held the Mathematical Institute, University of Oxford, on Saturday 7 June 2025. The conference explored the evolution of measurement from ancient methods and early instruments to modern standardisation, scientific accuracy, and philosophical reflection. Hosted by St Cross College, the event brought together historians, scientists, and philosophers to reflect on how we measure the world—and why it matters. Professor Richard Brown (National Physical Laboratory) explores the global journey toward measurement standardisation, the birth of the metric system, and the evolution of the International System of Units (SI)—the foundation for global scientific consistency. 🔗 Learn more about the HAPP Centre: https://www.stx.ox.ac.uk/happ-centre 🔗 Explore St Cross College: https://www.stx.ox.ac.uk