Kliewer, K. L. Argonne National Laboratory, Argonne, Illinois.
- First kind
- Second kind
- Third kind
- Modern examples
- Related Primary Literature
- Additional Reading
The expression perpetual motion, or perpetuum mobile, arose historically in connection with the quest for a mechanism which, once set in motion, would continue to do useful work without an external source of energy or which would produce more energy than it absorbed in a cycle of operation. This type of motion, now called perpetual motion of the first kind, involves only one of the three distinct concepts presently associated with the idea of perpetual motion.
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