The Classical Explanation of ENTANGLEMENT OF PARTICLES
According to Universal natural laws (Weltformel) there is nothing in the universe which is not entangled. The result of every interaction is determined by the properties of interacting particles. Independed properties do not exist. This is called determinism.
Nearly all interactions in universe refer to CBD- interactions (Collision-Bonding-Decay) An extreme important and most numerous interaction is, that two photons collide and interact by bonding. Natural laws are that by bonding spin orientation and vibration energies of bondings of the diphoton are adjusted to average and thus get identical. When the diphoton decay agains both photons have same kinetic energy in opposite directions. and same spin orientations. This is caused by the natural law, that matter in universe tends to achieve minimal spin energies of electrons. (Everything in universe is matter of bound electrons).
A laser is based on the averaging by CBD-interactions: Lots of photons do collisions in same direction, so that the bonding and decay reactions cause billions of entangled photons with same spin orientation, which are called polarized photons, and with same kinetic energues, which are called monochromatic photons.
Another example is second law of thermodynamics, which means the averaging of thermal energy. The definition of thermal energy is: Thermal energy represents the average kinetic energy of omnipresent photons (OPs). OPs do movements in various directions. By collisions all photons in not-heated areas get identical energies. When there is a permanent heating source the heat flows by CBD interactions to areas with lower energies.
In 1964 John Stewart Bell worked out a mathematical and experimental test which he claimed allowed to differentiate whether entanglement works by irrealistic quantum theories or on reality by Universal Laws of Nature. The test was based on prediction of properties of entangled particles.
Fact is that observations of experiments are always reality. So measurements can't differentiate between reality and irreality. Experimental results can always be explained by universal laws of nature, this means by reality.
An error is the thinking, that spin direction and polarization direction are properties of particles which can be measured. Physicist nowadays know, that measurement results just give information, if the directions, which can be all natural values are more to one side than to the other. This is due to an adjustment of various directions to the nearest of two opposite directions instead of a measurement.
Thus Bell's theorem is not valid for spin or polarisation. Polarization direction and spin direction are identical properties.
Especially magnetic fields adjust various orientations to one of the two orientations of a magnetic field.
In any way measurements of entangled properties /particles by identical procedure always show identical results.
But as soon as there is another CBD interaction, the former entanglement probably changes.
Tests of entangled particles should be done by kinetic energy (=momentum), which is the only property which can be directly and accurately measured.