Learn about particle size distribution and its mathematical treatment in this 27-minute lecture by Professor Emeritus Yutaka Tsuji from Osaka University. Explore the fundamental concepts of multiphase flow and particle behavior as presented by a distinguished expert in the field. Gain insights into the mathematical approaches used to analyze and describe particle size distributions, which are crucial for understanding various industrial and natural processes. Delve into the theoretical foundations that underpin numerical simulations of particulate systems, essential for applications in engineering and environmental sciences.