perpetual motion

noun Mechanics.

the motion of a theoretical mechanism that, without any losses due to friction or other forms of dissipation of energy, would continue to operate indefinitely at the same rate without any external energy being applied to it.

Origin of perpetual motion

First recorded in 1585–95

Words nearby perpetual motion

perpetual calendar, perpetual check, perpetual debenture, perpetual inventory, perpetually, perpetual motion, perpetual-motion machine, perpetuate, perpetuity, perphenazine, Perpignan

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for perpetual motion

This is what a perpetual-motion machine would be if such a machine were possible.
The Story of Great Inventions|Elmer Ellsworth Burns
His cottage was quite a curiosity-shop of models of engines, self-acting planes, and perpetual-motion machines.
Lives of the Engineers|Samuel Smiles
A favorite idea with perpetual-motion seekers is the utilization of the force of magnetism.
The Seven Follies of Science [2nd ed.]|John Phin
Many inventors of perpetual-motion machines offer their poverty as an excuse for not making a model or working machine.
The Seven Follies of Science [2nd ed.]|John Phin

But we give the description in the language of the inventor, as a fair type of this class of perpetual-motion machines.
The Seven Follies of Science [2nd ed.]|John Phin

British Dictionary definitions for perpetual motion

perpetual motion

noun

Also called: perpetual motion of the first kind motion of a hypothetical mechanism that continues indefinitely without any external source of energy. It is impossible in practice because of friction

Also called: perpetual motion of the second kind motion of a hypothetical mechanism that derives its energy from a source at a lower temperature. It is impossible in practice because of the second law of thermodynamics

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

单词	perpetual motion
释义	perpetual motion noun Mechanics. the motion of a theoretical mechanism that, without any losses due to friction or other forms of dissipation of energy, would continue to operate indefinitely at the same rate without any external energy being applied to it. Origin of perpetual motion First recorded in 1585–95 Words nearby perpetual motion perpetual calendar, perpetual check, perpetual debenture, perpetual inventory, perpetually, perpetual motion, perpetual-motion machine, perpetuate, perpetuity, perphenazine, Perpignan Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for perpetual motion This is what a perpetual-motion machine would be if such a machine were possible. The Story of Great Inventions\|Elmer Ellsworth Burns His cottage was quite a curiosity-shop of models of engines, self-acting planes, and perpetual-motion machines. Lives of the Engineers\|Samuel Smiles A favorite idea with perpetual-motion seekers is the utilization of the force of magnetism. The Seven Follies of Science [2nd ed.]\|John Phin Many inventors of perpetual-motion machines offer their poverty as an excuse for not making a model or working machine. The Seven Follies of Science [2nd ed.]\|John Phin But we give the description in the language of the inventor, as a fair type of this class of perpetual-motion machines. The Seven Follies of Science [2nd ed.]\|John Phin British Dictionary definitions for perpetual motion perpetual motion noun Also called: perpetual motion of the first kind motion of a hypothetical mechanism that continues indefinitely without any external source of energy. It is impossible in practice because of friction Also called: perpetual motion of the second kind motion of a hypothetical mechanism that derives its energy from a source at a lower temperature. It is impossible in practice because of the second law of thermodynamics Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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