Difference between revisions of "Perpetual Motion"

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(Translated from german wiki)
 
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From a theoretical point of view these machine are classified by the law they violate:
 
From a theoretical point of view these machine are classified by the law they violate:
  
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*Perpetuum Motion device of the first kind: This machine produces energy without input or more that it consumes and violates the first law of thermodynamics.
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*Perpetuum Motion device of the first kind: This machine produces energy without input or more that it consumes and violates the first law of thermodynamics. This kind is also called "overunity" by its fans.
 
*Perpetuum Motion device of the second kind: This machine converts heat to mechanical energy. Since this cools the environment, it cannot go on forever and violates the second law of thermodynamics.
 
*Perpetuum Motion device of the second kind: This machine converts heat to mechanical energy. Since this cools the environment, it cannot go on forever and violates the second law of thermodynamics.
 
*Perpetuum Motion device of the third kind: A machine that can run indefinitely without doing work. Since friction and other interactions with the environment cannot be avoided, such a machine cannot be build (but one can come very close)
 
*Perpetuum Motion device of the third kind: A machine that can run indefinitely without doing work. Since friction and other interactions with the environment cannot be avoided, such a machine cannot be build (but one can come very close)

Revision as of 22:40, 23 February 2011

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A Perpetuum Motion (lat: eternal movement) device is a hypothetical machine that can produce work indefinitely without energy source or produce more energy than they consume.

A great number of inventors claim that they have build a perpetual motion machine, but none of them could prove it. Often these claims were made by fraudsters and scammers. Since such a device would violate the laws of thermodynamics, it is also scientific consensus that it is impossible. .

Classes of Perpetuum Motion devices

PM nach Leonardo da Vinci
PM Bessler Rad

From a theoretical point of view these machine are classified by the law they violate:

  • Perpetuum Motion device of the first kind: This machine produces energy without input or more that it consumes and violates the first law of thermodynamics. This kind is also called "overunity" by its fans.
  • Perpetuum Motion device of the second kind: This machine converts heat to mechanical energy. Since this cools the environment, it cannot go on forever and violates the second law of thermodynamics.
  • Perpetuum Motion device of the third kind: A machine that can run indefinitely without doing work. Since friction and other interactions with the environment cannot be avoided, such a machine cannot be build (but one can come very close)

Examples

Weblinks

Versions of this article in other languages

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