Source status: Attributed to Mayer, Joule, and Helmholtz, formalized by Clausius
Energy can't be created or destroyed, only converted from one form to another.
- Mayer, Joule, and Helmholtz, formalized by Clausius
You can't get more energy out than you put in.
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Energy is never lost, only turned into a form you can't use.
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A machine that runs forever without a fuel source does not exist, and the person selling you one knows it.
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This law belongs with Murphy's Miscellaneous Laws, where small assumptions, timing, and system complexity tend to turn into memorable failures.
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