entropy explained

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Home Library Modern Richard Carrier Entropy Explained

Entropy Explained (2003, 2005)

Richard Carrier

Addendum A to "Bad Science, Worse Philosophy: the Quackery and Logic-Chopping of David Foster's ThePhilosophical Scientists" (2000)

Introduction

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The concept of entropy is generally not well understood among laymen. With the help of several physicists, includingWolfgang Gasser and Malcolm Schreiber, I have composed the following article in an attempt to correct a common

misunderstanding.[1] Contrary to what many laymen think, there is no Law of Entropywhich states that order must

always decrease. That is a layman's fiction, although born from a small kernel of reality. The actual Law of Entropyisbetter known as the Second Law of Thermodynamics. The First Law is that energy is not created or destroyed, and

the Third Law is that absolute zero cannot be achieved--each of these laws is actually entailed from the first, in

conjunction with certain other assumptions. But it is the Second Law that many laymen incorrectly think says that order

must always decrease.

In traditional thermodynamics, entropy is a measure of the amount of energy in a closed system that is no longeravailable to effect changes in that system. A system is closed when no energy is being added to or removed from it,

and energy becomes unavailable not by leaving the system, but by becoming irretrievably disordered, as a

consequence of the laws of statistical mechanics. But even though the total amount of energy that is irretrievablydisordered will increase, this does not mean order cannot increase somewhere else in that same system. This is

where confusion arises. Of course, entropy can be measured in an open system, too, but this introduces additional

variables, and of course the Second Law then no longer applies. But even when the Second Law applies, it is sti ll

possible for a closed system to produce order, even highly elaborate order, so long as there is a greater increase indisorder somewhere else in the system.

Consider, for example, how the atmosphere remains attached to earth in an orderly sphere rather than just wandering

off at random. In fact, though a layman would say this system is highly ordered and doesn't become notably

disordered over time (billions of years and the air is still here), the entropy of this system doesincrease: though a

relatively orderly arrangement of gases around earth is also produced, at the same time a large quantity of energy hasbecome disordered as a result. For example, friction created by the impact of these gas molecules striking the earth

and each other produces heat that ultimately radiates off into space. Thus, the Second Law is conserved: the total

amount of disordered energy is increased, even as a visible increase in order is produced. Thus, though an increasein entropy entails an increase in disorder, it does so only overall, and therefore as long as the amount of energy thatbecomes ordered is less than the amount of energy that becomes disordered, any amount of order can arise in a

closed system without violating the Second Law.[2] The natural universe is filled with examples of local order being

produced by increasing overall entropy: the structure of atoms has this effect on crystalization, the nature of subatomicparticles has an ordering effect on the sorts of molecules that can form, and so on.[3] In fact, the whole of chemistry,

the foundation of life, is an ideal example. Hence the Second Law cannot be invoked against a natural originof life,since under certain conditions there can be a significant increase in order while the total amount of disordered energy

alsoincreases.[4]

Seen on a cosmic scale, although an increase in entropy entails an increase in the quantity of energy in the universe
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that is irretrievably disordered, this is not the same thing as a tendency toward disorder everywhere in the universe,since the rest of the energy in the universe sti ll has to be accounted for, and could behave in any number of ways,

depending on the forces and structures found there. Of course, though in a closed system the quantity of energy that is

irretrievably disordered increases, that very same energy canbe reordered by an expenditure of new energy

introduced to the system. Or by allowing some of the disordered energyto escape a system, the entropy of that

system can be made to decrease. But either way, we still increase the quantity of disordered energy in the universe,and so far as we know it can never be otherwise. Thus, the total amountof order in the universe will certainly decrease

(though due to the Third Lawit will never disappear entirely), yet even as this happens, parts of the universe cancontinue to become more orderly without violating the Second Law.

In fact, order can onlybe produced by increasing entropy. This is because producing order out of chaos involves achange in the system, which can only be produced by expending energy. The expenditure of energy is never perfectly

efficient and so it always increases the overall amount of energy that is irretrievably disordered, even as order is

produced from the remaining energy. Since ordering requiresan increase in entropy, it is a bit ironic to find

creationists claiming entropy as an anti-ordering process (which it is not) in order to "prove" special creation, when it

would make more sense to use it as an orderingprocess to "prove" divine arrangement of the laws of physics.

However, I must head off such a switch-hitting strategy. There is no sign of intelligent design in the Second Law. It isactually the only logical way that any mindless, material universe would operate. Since i t is the logically necessary

result of any universe which contains bits of mass-energy that never change in quantity, all that is needed for this law tomaterialize is such a universe, leaving no room for any intelligent tinkering--except at the point of the creation of those

bits of stuff or the space and time in which they move, but that is another story. When we examine the Second Lawalone, we see that it would be the natural result of any undesigned but merely existing universe, which contained an

unchanging quantity of bits. At the same time, we see that this law prevails over and defines every change in the

universe we happen to be in, and yet in no way prevents natural order from arising--so long as energy becomesdisordered in producing it.

Back to Part 7 of Review Back to Table of Contents

[1] The present article has been rewritten several times, since in past incarnations it confused many readers.

Hopefully it is finally in a simpler form that is clear enough to everyone. For further discussion see Dr. Frank Lambert'sEntropy Is Simple(which covers almost all the important issues surrounding entropy) and Brig Klyce's The Second

Law of Thermodynamics(which analyzes how physicists have misled laymen with their sloppy writing).

[2] See John Baez, Can Gravity Decrease Entropy?(2000). Of course, the real earth is not a closed system (e.g. it

receives radiation from the sun), but this analogy imagines an earth alone in the middle of an otherwise-empty space
http://math.ucr.edu/home/baez/entropy.htmlhttp://www.panspermia.com/seconlaw.htmhttp://www.entropysimple.com/http://infidels.org/library/modern/richard_carrier/foster0.htmlhttp://infidels.org/library/modern/richard_carrier/foster7.html


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randomly filled with gas.

[3] For example, seeAnother Face of Entropy: Particles Self Organize to Make Room for Randomness," Science

News154:7 (August 15, 1998), pp. 108-9: when large and small moleculesof microscopic but not quite atomic scale

are mixed at random, order naturally results, in contravention of the popular (and mistaken) idea of the Law of Entropy.However, the phenomenon still obeys the actual Law, because the system increases the entropy of the small

molecules while decreasing the entropy of the large ones, and the sum resultis an increase in entropy.

[4] For more on the origin of life, seeAre the Odds against the Origin of Life Too Great to Accept?.

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