What is conserved in the various "forms/types" of entanglement? What law is applicable for each of the "entanglement factors"? Particles can be entangled in various way/factors such as momentum, spin, polarization etc. For spin entanglement we can say that: The law of conservation of (angular) momentum explains (at least partially) why the spins must be correlated. How about the other properties (on which a particle may be entangled), such as position or polarization etc? Which law would be applicable in each of the cases above?