What does perpetual motion mean?

Definitions for perpetual motion
per·pet·u·al mo·tion

Here are all the possible meanings and translations of the word perpetual motion.

Princeton's WordNet

  1. perpetual motion(noun)

    motion that continues indefinitely without any external source of energy; impossible in practice because of friction


  1. perpetual motion(Noun)

    The motion of some hypothetical device that continues forever with no obvious input of energy in violation of the laws of thermodynamics.


  1. Perpetual motion

    Perpetual motion is a conceptual framework, that describes "motion that continues indefinitely without any external source of energy; impossible in practice because of friction." It can also be described as "the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear". There is a scientific consensus that perpetual motion in an isolated system is impossible as it would violate the first or second law of thermodynamics. Cases of apparent perpetual motion can exist in nature, but either are not truly perpetual or cannot be used to do work without changing the nature of the motion. For example, the motion of a planet around its star may appear "perpetual," but interplanetary space is not completely frictionless, so planets' orbital motion is very gradually slowed over time. The fly-by of a space probe past a planet can be used to speed up the probe but in doing so alters the motion and reduces the energy of the planet in its orbit around the Sun. The flow of current in a superconducting loop can be used as an energy storage medium, but just as with a battery, using it to power a device will remove the equivalent amount of energy from the current in the loop.

Suggested Resources

  1. perpetual motion

    Song lyrics by perpetual motion -- Explore a large variety of song lyrics performed by perpetual motion on the Lyrics.com website.

How to pronounce perpetual motion?

  1. Alex
    US English

How to say perpetual motion in sign language?

  1. perpetualmotion


  1. Chaldean Numerology

    The numerical value of perpetual motion in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of perpetual motion in Pythagorean Numerology is: 2

Examples of perpetual motion in a Sentence

  1. Jennifer Emmolo:

    We love that students can swing their feet back and forth ... and be in perpetual motion and can do that without bothering anyone else.

  2. David Michôd:

    What is it exactly that's going to happen this time that didn't happen at any point in the past 15 years? it seems patently absurd to me to be contemplating this. The circularity, the perpetual motion of that delusion is extraordinary.

Images & Illustrations of perpetual motion

  1. perpetual motionperpetual motionperpetual motionperpetual motionperpetual motion

Translations for perpetual motion

From our Multilingual Translation Dictionary

  • mouvement perpétuelFrench
  • अविराम गतिHindi

Get even more translations for perpetual motion »


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"perpetual motion." Definitions.net. STANDS4 LLC, 2019. Web. 17 Sep. 2019. <https://www.definitions.net/definition/perpetual+motion>.

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