This article is about the physical quantity: for other uses of the word "energy", see
Energy (disambiguation).* In
physics and other
sciences, energy (from the
Greek ενεργός, energos, "active, working") is a
scalar physical quantity that is a property of objects and systems of objects which is conserved by nature. Several different forms, such as
kinetic,
potential,
thermal,
electromagnetic,
chemical,
nuclear, and
mass have been defined to explain all known natural phenomena.
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