Perpetual motion

Perpetuum Mobile of Villard de Honnecourt (about 1230).

Perpetual motion is motion of bodies that continues indefinitely. This is impossible because of friction and other energy-dissipating processes. A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics.

单词	Perpetual motion machine of the third kind
释义	Perpetual motion machine of the third kind 英语百科 Perpetual motion Perpetual motion is motion of bodies that continues indefinitely. This is impossible because of friction and other energy-dissipating processes. A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics.
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Perpetual motion machine of the third kind

Perpetual motion