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conserved quantity

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A conserved quantity is something that remains constant in amount over time and cannot be created nor destroyed. Conserved quantities follow conservation laws. For example, in an isolated system, energy is a conserved quantity. It can change form, for example, from light to heat; but, the total amount of energy in the system will not change. Other examples of conserved quantities in an isolated system are: electric charge, momentum, and angular momentum.

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