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In physics, the law of conservation of energy states that the total energy of an isolated system in a given frame of reference remains constant — it is said to be conserved over time.

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A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances

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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.

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Vaporization of an element or compound is a phase transition from the liquid phase to vapor.

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The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

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Energy that a body possesses by virtue of being in motion

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The strength and vitality required for sustained physical or mental activity