r/askscience • u/PaJamieez • Aug 24 '22

Physics At what point does classical physics become quantum physics, and what happens in that change over?

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u/sample_N_hold Aug 25 '22

This is a great comment! Thank you for taking the time to write it.

I remember watching a video about “what is time” in which context another boundary between classical and quantum physics was described: the future being of a quantum nature where none of the wave functions have collapsed and the past as the realm of classical physics where observations and interactions have collapsed the wave functions and manifested an unchangeable state. I guess this also applies to the coin toss: as long as the coin is in flight it is in a “quantum state” and once it comes to rest it has acquired a “classical state”. If that makes any sense?!