Conservation-of-energy



noun, Physics.
1.
the principle that in a system that does not undergo any force from outside the system, the amount of energy is constant, irrespective of its changes in form.
noun
1.
the principle that the total energy of any isolated system is constant and independent of any changes occurring within the system

apparently coined in French by Leibnitz in 1692; attested in English from early 18c. as conservatio virum vivarum or partially nativized versions of it. The exact phrase is attested from 1853.
conservation of energy
A principle stating that the total energy of a closed system remains constant over time, regardless of other possible changes within the system. It is related to the symmetry of time invariance. See also invariance, thermodynamics.

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