The book contains 40 tasks of varying degrees of complexity, which are based on the materials of seminars on the course Physical Kinetics with students of the Faculty of General and Applied Physics of MIPT. All tasks are given detailed solutions, and the comments reflect their relationship with questions and methods of modern physical kinetics. A brief introduction provides the necessary information for solving and understanding problems. The book is intended for students and graduate students of higher educational institutions studying theoretical physics, teachers and scientists in the fields of physical kinetics and condensed matter physics.