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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

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The formation of rust on iron is a chemical change.

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Physical Change 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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he strength and vitality required for sustained physical or mental activity.

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a single distinct meaningful element of speech or writing, used with others (or sometimes alone) to form a sentence and typically shown with a space on either side when written or printed.