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RE: Defining time with atomic fountains
Except at the big bang itself, time (actually spacetime) is always well defined. If we take a system that is a box (even if it does not match our universe), why could not time be defined in there?
OK. I have heard about ENTROPY AS AN ARROW OF TIME. In the particles box (equilibrium state), isn't the entropy kinda saturated?
Entropy increases or stay constant with time, this is true. But this does not influence how time passes by.