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It isn't entirely clear what you mean with "perpetual machine". If you mean the old dream of the "perpetuum mobile", such a machine would violate the Law of Conservation of Energy; there are various reasons to assume that this law can't be violated:* Despite lots of attempts, by thousands of ingenious inventors, and over centuries, nobody has managed to violate Conservation of Energy so far.

* Violating Conservation of Energy would also violate lots of other laws of physics, which are generally considered to be true. For example, Conservation of Mass, and Conservation of Momentum.

* By Nöther's Theorem, the possibility that the amount of energy changes over time would be equivalent to the laws of physics changing over time! - Nowadays, the Law of Conservation of Energy is normally derived from Nöther's Theorem.

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