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Define the law of conservation of energy in your own words using scientific language.

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The law of conservation of energy states that the total energy of an isolated system remains constant in time: energy cannot be created or destroyed, only transformed between different forms (e.g., kinetic, potential, thermal, chemical, electromagnetic) or transferred between parts of the system. In mathematical form for a closed system this is written ΔE_total = 0 or E_initial = E_final. In thermodynamics this principle appears as the first law (ΔU = Q − W), and in relativistic physics it is extended to conservation of mass–energy (E = mc^2) so that the combined mass–energy is conserved.