The conservation of energy

A clear‑headed guide to one of the most fundamental ideas in modern science, this work explains how energy—whether in heat, motion, electricity or chemistry—never disappears but merely changes form. Written in plain language and enriched with familiar illustrations, it walks readers through the history of the principle, the experiments that proved it, and the simple equations that describe its behaviour in everyday phenomena.

Beyond the physics, the book includes an appendix that explores how the same law can be seen at work in living organisms and the human mind. Essays by respected scholars connect the conservation of energy to physiology, mental processes and even broader philosophical questions, offering a thought‑provoking glimpse of how a single scientific insight can echo through many fields of study.