Conservation of energy

:This article is about the physics principle. For information on using energy resources sustainably, see Energy Conservation.

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Conservation of energy, also known as the first law of thermodynamics, is possibly the most important, and certainly the most practically useful of several conservation laws in physics.

Related Topics:
Thermodynamics - Conservation law - Physics

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The law states that the total inflow of energy into a system must equal the total outflow of energy from the system, plus the change in the energy contained within the system. In other words, energy can be converted from one form to another, but it cannot be created or destroyed.

Related Topics:
Energy - System

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The law of conservation of energy excludes the possibility of perpetuum mobile of the first kind.

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