conservation of energy

in a sentence

conservation of energy in physics

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  The First Law of Thermodynamics applies conservation of energy to thermodynamic systems.

  conservation of energy = the fundamental principle that the total energy of an isolated system is constant despite internal changes
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  This might appear to violate the law of conservation of energy, but in fact the sophons are only 'borrowing' energy from the structure of vacuum.†  (source) Cixin Liu, The Three-Body Problem, 2008

  conservation of energy = physics:  the fundamental principle that the total energy of an isolated system is constant despite internal changes
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  The physical organization, its decay, the indestructibility of matter, the law of the conservation of energy, evolution, were the words which usurped the place of his old belief.†  (source) Leo Tolstoy, Anna Karenina, 1877