What is another word for perpetual motion machine?
Pronunciation: [pəpˈɛt͡ʃuːə͡l mˈə͡ʊʃən məʃˈiːn] (IPA) 
A perpetual motion machine is a theoretical device that is designed to operate indefinitely without requiring any energy input. However, despite many attempts, such a machine has never been built due to the laws of thermodynamics. Nevertheless, there are several alternative terms that can be used to describe a perpetual motion machine, such as a perpetual motion device, perpetual motion engine, or perpetual motion generator. Other related terms include perpetual engine, continuous motion machine, and self-sustaining machine. While these terms are often used interchangeably, they all refer to the same concept of a machine that operates indefinitely without outside energy sources.
