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Why is energy considered lost?

Updated: 9/25/2023
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8y ago

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Because it is. Once you use energy up, it still exists in some form (due to energy conservation), but it's no longer usable. For more information, read about the Second Law of Thermodynamics (for example, in the Wikipedia).

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8y ago
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8y ago

Energy is lost when it appears as low-temperature heat, that is heat at very little above the ambient temperature, because it is not easy to use it for anything.

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