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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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Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different 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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The rapid change of water into steam, especially in a boiler.

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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.