define energy in brief in 30 words
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In general, the word energy refers to a concept that can be paraphrased as "the potential for causing changes", and therefore one can say that energy is the cause of any change. Energy is a conserved quantity, meaning that it cannot be created or destroyed, but only converted from one form into another.
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Energy: A Scientific Definition
Forms of Energy. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and...
Law of Conservation of Energy. According to the law of conservation of energy, the total energy of a system remains...
Units of Energy. The SI unit of energy is the joule (J) or newton-meter (N
m). The joule is also the SI unit of work.
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