conservation of energy

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con·ser·va·tion of en·er·gy

the principle that the total amount of energy in a closed system remains always the same, none being lost or created in any chemical or physical process or in the conversion of one kind of energy into another, within that system.
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conservation of energy

The principle according to which energy cannot be created or destroyed, but is transformed into other forms.
See also: energy
Medical Dictionary, © 2009 Farlex and Partners