Perpetual motion machines of the second type, which convert warm water into electrical current and ice cubes, are prohibited by the Second Law of Thermodynamics. The second law is a bit harder to understand, as it is essentially Bayesian in nature. Yes, really. The essential physical law underlying the Second Law of Thermodynamics is a theorem which can be proven within the standard model of physics: In the development over time of any closed system, phase space volume is conserved.
