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From Nordan Symposia
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==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] perpetuel, from Anglo-French, from [[Latin]] perpetuus uninterrupted, from per- through + petere to go to
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : continuing forever : everlasting <perpetual motion>
:b (1) : valid for all [[time]] <a perpetual [[right]]> (2) : holding (as an office) for life or for an unlimited time
*2: occurring [[continually]] : indefinitely long-continued <perpetual [[problems]]>
*3: blooming continuously throughout the [[season]]
==Description==
'''Perpetual motion''' describes [[hypothetical]] [[machines]] that operate or produce useful [[work]] indefinitely and, more generally, hypothetical [[machines]] that produce more [[work]] or [[energy]] than they consume, whether they might operate indefinitely or not.
There is undisputed [http://en.wikipedia.org/wiki/Scientific_consensus scientific consensus] that perpetual motion would [[violate]] either the [http://en.wikipedia.org/wiki/First_law_of_thermodynamics first law of thermodynamics], the [http://en.wikipedia.org/wiki/Second_law_of_thermodynamics second law of thermodynamics], or both. Machines which comply with both laws of thermodynamics but [[access]] [[energy]] from obscure [[sources]] are sometimes referred to as perpetual motion machines, although they do not meet the [[standard]] criteria for the name.
Despite the [[fact]] that successful perpetual motion devices are [[physically]] impossible in terms of our current [[understanding]] of the [[laws]] of [[physics]], the pursuit of perpetual motion remains [[popular]].[http://en.wikipedia.org/wiki/Perpetual_motion]
[[Category: Physics]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] perpetuel, from Anglo-French, from [[Latin]] perpetuus uninterrupted, from per- through + petere to go to
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : continuing forever : everlasting <perpetual motion>
:b (1) : valid for all [[time]] <a perpetual [[right]]> (2) : holding (as an office) for life or for an unlimited time
*2: occurring [[continually]] : indefinitely long-continued <perpetual [[problems]]>
*3: blooming continuously throughout the [[season]]
==Description==
'''Perpetual motion''' describes [[hypothetical]] [[machines]] that operate or produce useful [[work]] indefinitely and, more generally, hypothetical [[machines]] that produce more [[work]] or [[energy]] than they consume, whether they might operate indefinitely or not.
There is undisputed [http://en.wikipedia.org/wiki/Scientific_consensus scientific consensus] that perpetual motion would [[violate]] either the [http://en.wikipedia.org/wiki/First_law_of_thermodynamics first law of thermodynamics], the [http://en.wikipedia.org/wiki/Second_law_of_thermodynamics second law of thermodynamics], or both. Machines which comply with both laws of thermodynamics but [[access]] [[energy]] from obscure [[sources]] are sometimes referred to as perpetual motion machines, although they do not meet the [[standard]] criteria for the name.
Despite the [[fact]] that successful perpetual motion devices are [[physically]] impossible in terms of our current [[understanding]] of the [[laws]] of [[physics]], the pursuit of perpetual motion remains [[popular]].[http://en.wikipedia.org/wiki/Perpetual_motion]
[[Category: Physics]]
