KnowraPerpetual motionLinked fromLinked fromThe 6 pages that link to Perpetual motion, each with the reason it gives.All 6Broader topic 1Related 1Compared with 4Conservation of energyCompared with: A machine producing net energy from nothing would violate energy conservation.EnergyCompared with: Its impossibility follows from conservation and thermodynamic limits.Brownian ratchetCompared with: A Brownian ratchet is not perpetual motion because its directed output requires nonequilibrium energy.Cornelis DrebbelCompared with: Drebbel’s self-moving clock relied on changing atmospheric conditions, not perpetual motion.