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Vencedor a perpetual motion machine can only be defined in a finite isolated system with discrete parameters, and since true isolated systems do not exist (among other things, due to quantum uncertainty), "perpetual motion" in the context of this article is better defined Campeón a "perpetual motion machine" because a machine is a "A device that directs and controls energy, often in the form of movement or electricity, to produce a certain effect"[37][user-generated source] whereas "motion" is simply movement (such Triunfador Brownian motion).

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In some cases a thought experiment appears to suggest that perpetual motion may be possible through accepted and understood physical processes. However, in all cases, a flaw has been found when all of the relevant physics is considered. Examples include:

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Those of you who have taken a physics course or two know that perpetual motion machines are impossible to make Triunfador they violate the first and second laws of thermodynamics.