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27. Natural Reality / A. Classical Physics / 2. Thermodynamics / d. Entropy

[inevitable gradual dispersal of universal energy]

6 ideas
Change goes from possession to loss (as in baldness), but not the other way round [Aristotle]
     Full Idea: Change occurs from possession to privation, but from privation to possession is impossible; one who has gone blind does not recover sight nor does a bald man regain his hair nor does a toothless man grow new ones.
     From: Aristotle (Categories [c.331 BCE], 13a35)
     A reaction: Although this seems like an insight into entropy, it isn't an accurate observation, since trees lose their leaves, and then regain them in spring. Maybe somewhere men regrow their hair each spring.
It is quicker to break things up than to assemble them [Lucretius]
     Full Idea: Anything can be more speedily disintegrated than put together again.
     From: Lucretius (On the Nature of the Universe [c.60 BCE], I.558)
     A reaction: Clearly the concept of entropy was around long before anyone tried to give a systematic or mathematical account of it.
Third Law: total order and minimum entropy only occurs at absolute zero [Close]
     Full Idea: The third law of thermodynamics says that a hypothetical state of total order and minimum entropy can be attained only at the absolute zero temperature, minus 273 degrees Celsius.
     From: Frank Close (Theories of Everything [2017], 3 'Arrow')
     A reaction: If temperature is energetic movement of atoms (or whatever), then obviously zero movement is the coldest it can get. So is absolute zero an energy state, or an absence of energy? I have no idea what 'total order' means.
Becoming disordered is much easier for a system than becoming ordered [Bardon]
     Full Idea: Systems move to a higher state of entropy …because there are very many more ways for a system to be disordered than for it to be ordered. …We can also say that they tend to move from a non-equilibrium state to an equilibrium state.
     From: Adrian Bardon (Brief History of the Philosophy of Time [2013], 5 'Thermodynamic')
     A reaction: Is it actually about order, or is it just that energy radiates, and thus disperses?
Entropy is the only time-asymmetric law, so time may be linked to entropy [New Sci.]
     Full Idea: All our physical laws are time-symmetric, ...so things can run forwards or backwards. But entropy is an exception, saying that disorder increases over time. Many physicists therefore suspect that the flow of time is linked to entropy.
     From: New Scientist writers (New Scientist articles [2013], 2017.02.04)
There is no second 'law' of thermodynamics; it just reflects probabilities of certain microstates [Baron/Miller]
     Full Idea: According to contemporary statistical mechanics the second law of thermodynamics is not really a law at all, but merely reflects to probabilities of certain microstates, conditional on local boundary conditions having certain properties.
     From: Baron,S/Miller,K (Intro to the Philosophy of Time [2019], 5.6.1)
     A reaction: A nice illustration of how metaphysicians have been seduced by the 'laws' of nature into falsely inferring all sorts of natural necessities. Entropy is normally assumed to be totally inevitable, because of some natural force. It's just a pattern.