Difference between revisions of "Perpetual motion machine"
DrSandstone (talk | contribs) |
|||
| Line 5: | Line 5: | ||
Another type of perpetual motion machine simply uses its initial energy to remain in motion perpetually. If entropy is always increasing, even in closed (and isolated) systems, then indefinite motion is impossible because an increase in the disorder of the system will inevitably disrupt the motion. The [[Second Law of Thermodynamics]] predicts that a perpetual motion machine in this sense is impossible, and none has ever been created. | Another type of perpetual motion machine simply uses its initial energy to remain in motion perpetually. If entropy is always increasing, even in closed (and isolated) systems, then indefinite motion is impossible because an increase in the disorder of the system will inevitably disrupt the motion. The [[Second Law of Thermodynamics]] predicts that a perpetual motion machine in this sense is impossible, and none has ever been created. | ||
| + | |||
| + | Since both types of perpetual motion machine are flawed in both theory and in practice, they are clearly [[pseudoscience]]. Despite this, [[liberal]] websites have professed to offer "free energy" devices for sale.<ref>http://www.free-energy-info.co.uk/</ref><ref>http://www.fuellesspower.com/</ref><ref>http://www.magniwork.com/</ref> | ||
==References== | ==References== | ||
<references/> | <references/> | ||
[[category: physics]] | [[category: physics]] | ||
Revision as of 00:44, February 13, 2011
A perpetual motion machine is a hypothetical isolated system capable of having internal motion indefinitely. Many attempts to build such a system have failed.
One type of a perpetual motion machine would continue to perform work without new energy, thereby serving as an unlimited energy source. This is prohibited by the First Law of Thermodynamics.
Another type of perpetual motion machine simply uses its initial energy to remain in motion perpetually. If entropy is always increasing, even in closed (and isolated) systems, then indefinite motion is impossible because an increase in the disorder of the system will inevitably disrupt the motion. The Second Law of Thermodynamics predicts that a perpetual motion machine in this sense is impossible, and none has ever been created.
Since both types of perpetual motion machine are flawed in both theory and in practice, they are clearly pseudoscience. Despite this, liberal websites have professed to offer "free energy" devices for sale.[1][2][3]