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Discover LudwigThe phrase "Perpetual motion" is correct and usable in written English
It can be used in discussions about physics, engineering, or theoretical concepts related to machines that can operate indefinitely without an energy source. Example: "The concept of perpetual motion has fascinated inventors for centuries, despite being deemed impossible by the laws of thermodynamics."
Dictionary
Perpetual motion
noun
The motion of some hypothetical device that continues forever with no obvious input of energy in violation of the laws of thermodynamics.
Exact(51)
Perpetual motion proponents always call themselves heretics.
Perpetual motion was a Miranda trademark.
"Perpetual Motion," director Kimberly Miner, U.S. 1 min., 26 seconds.
"This guy is perpetual motion.
Love!! Perpetual Motion!!!
He was the ultimate in perpetual motion.
Similar(9)
The documentary follows the perpetual-motion Amatos.
"And please don't call it a perpetual-motion machine".
His pieces were fascinating, introspective perpetual-motion meditations.
Basically, there are three kinds of perpetual-motion devices.
Property has become a perpetual-motion machine enforcing class division.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com