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Of course these are models. And to be able to recognise that entropy increases with time is an example for their usefulness.
by lagrange77 1y ago
Of course these are models. And to be able to recognise that entropy increases with time is an example for their usefulness.
- mrtksn 1y agoDoes it increase over time or does it do its thing and in our model we decided that stages of it is called time?
- lagrange77 1y agoRight, i had the same thought. What we can say is, that the quantities we call t and S are correlated.
- Morizero 1y agoAbsolute entropy of a system is calculated either by integrating heat capacity/temp at constant pressure from 0kelvin to the measured temperature, or by calculating via Shannon's method using average amount of information in a discrete random variable. There is no time factor in any absolute entropy equation. Empirically, if you measure the entropy of a closed system at a given time, and you measure the entropy of that same closed system at a different time, then calculate the deltas of each, their signs match so long as the time delta is finite and the system isn't empty. So stated plainly, as time increases, so does entropy. By combining these first principle formulae with the empirical results on entropy, you arrive at the second law of thermodynamics. However, like I said before, we're not really sure why the signs match and it's considered to be an unsolved problem in physics. https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_physics#Foundations_of_physics https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_p...