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Law of Conservation of energyOPENIn 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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Law of Conservation of energyOPENIn 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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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. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

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Vaporization (or vapourisation) of an element or compound is a phase transition from the liquid phase to vapor. There are two types of vaporization: evaporation and boiling. Evaporation is a surface phenomenon, whereas boiling is a bulk phenomenon.

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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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Kinetic Energyenergy that a body possesses by virtue of being in motion.

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Kinetic Energyenergy 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.