Retrieving "Thermodynamic Arrow Of Time" from the archives

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1. Time Reversal

   Linked via "thermodynamic arrow of time"

   The most significant barrier to observable time reversal is the Second Law of Thermodynamics. This law dictates that the total entropy ($S$) of an isolated system can only increase or remain constant: $\Delta S \ge 0$. Time reversal would require a spontaneous, large-scale decrease in entropy, violating this law.
   The statistical mechanics explanation for the thermodynamic arrow of time posits that the present state of the [universe](/…

2. Time Reversal

   Linked via "thermodynamic arrow"

   Perceptual and Psychological Reversal
   Human perception of time is inherently asymmetric. Subjective time flows linearly, driven by memory formation and cognitive processing, processes which are themselves subject to the thermodynamic arrow.
   The Chronometric Lag