永えい久きゅう機き関かん

noun

perpetual motion machine

A hypothetical machine that can do work indefinitely without an energy source. Used in physics and engineering contexts.

• 永えい久きゅう機き関かんは熱ねつ力りき学がくの法ほう則そくに反はんするため実じつ現げん不ふ可か能のうだ。

  A perpetual motion machine is impossible because it violates the laws of thermodynamics.