Physics I-IV is the popular classic on experimental physics that has been beloved for over 20 years. Continuously updated, this work is in tune with the times, yet its original goal remains: to spark interest in the beauty of nature and to foster a fundamental understanding of modern physics with its many contemporary applications. Physics I covers classical mechanics and thermal physics. After an introductory tour through the fascinating world of physics, the basic concepts of motion and Newton's laws are explained. In a chapter on solid matter—from hard diamonds to jelly—the reader gains insight into the exploration of modern materials and nanophysics. The chapters on liquids, oscillations, and waves also include important topics such as the physics of flight and parametric resonance.