Thermodynamics is the branch of physics that studies heat, energy, and how they change and move between objects and systems. It includes laws that explain why some energy changes are possible and others are not.
From Greek *thermo-* 'heat' and *dynamis* 'power, force'. The name reflects the study of how heat produces work and motion.
Thermodynamics quietly governs everything from engines to your own body heat. Its laws even tell us why time seems to move in one direction: energy naturally spreads out instead of neatly re‑packing itself.
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