perpetual motion

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perpetual motion

n.
The hypothetical continuous operation of an isolated mechanical device or other closed system without a sustaining energy source.

perpetual motion

n
1. 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
2. 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

perpet′ual mo′tion


n.
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.
[1585–95]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.perpetual motion - motion that continues indefinitely without any external source of energyperpetual motion - motion that continues indefinitely without any external source of energy; impossible in practice because of friction
motion - a state of change; "they were in a state of steady motion"
References in periodicals archive ?
Organising the event, he was contacted by charlatans promising everything from perpetual motion machines to power which would cost nothing.
For 170 years, Scientific American has published the latest in science and innovation, from coverage of perpetual motion machines to contributed articles by Albert Einstein to thought pieces on the most recent topic dujour, GMOs.
Orson Welles' radio production of 'War of The Worlds' is an aforementioned example, and history is replete with conmen selling various curiosities - from perpetual motion machines to penile enlargers.
Among the topics are free energies of staging a scenario and perpetual motion machines of the third kind, finite-time thermodynamic tools to analyze dissipative processes, concepts and some numerical examples of the emergence of simple structures in complex phenomena, laser energy deposition in nanodroplets and nuclear fusion driven by Coulomb explosion, and biomolecular homochirality as a quasi-fossil of the evolution of life.
Outside our bedroom window, several rubyft, crowned kinglets flitted in and out of sight in the chartreuse t foliage like tiny perpetual motion machines.
Then is shown how black holes violate the limits, acting as perpetual motion machines that produce more energy than they consume.

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