Physics – natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, ...

Time feels like the most basic feature of reality. Seconds tick, days pass and everything from planetary motion to human memory seems to unfold along ...

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around ...

Based on: Elements of Physics. For Medical Students. By Frederic James M. Page, B.Sc. (London), F.I.C., Associate of the Royal College of Mines. Illustrated. Chicago ...