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entropy is not disorder

Order does not necessarily involve movement. Questions about examples of why entropy is NOT disorder Thread starter GeorgeWBush; Start date Oct 23, 2011 Oct 23, 2011 Is The Matter In Our Universe Fundamentally Stable Or Unstable? Order is troops reporting to their proper posts to perform their proper duties in accordance to their commander's orders. We can not make up our minds here as far as the definition is concerned. The concept of entropy emerged from the mid-19th century discussion of the efficiency of heat engines. For example, melting a block of ice means taking a highly structured and orderly system of water molecules and converting it into a disorderly liquid in which molecules have no fixed positions. - a Swiss watch with intricate internal workings or a sundial? Entropy is the number of configurations of a system that are consistent with some constraint. In the former case, one posits that entropy is not defined for a microstate, but for a macrostate (average or expectation value) so that an ‘ensemble sampling’ is a critical ingredient whereas ‘spatial sampling’ is not so. I am pleased if I have succeeded in bringing you a little clearer understanding on the subject of entropy. A dynamic system in perfect equilibrium represented, according to statistical thermodynamics, a system in "perfect disorder". 5 “100% humidity” corresponds to the maximum concentration of water molecules in the vapor above the liquid at the given temperature. Entropy is a fundamental concept, spanning chemistry, physics, mathematics and computer science, but it is widely misunderstood. Entropy. source ( "A key idea from quantum mechanics is that the states of atoms, molecules, and entire systems are discretely quantized. From the molecular description of heat content and temperature, Boltzmann showed that entropy must represent the total number of different ways the molecules could move, tumble or vibrate. This was the era of the steam locomotive. Now as far as I know from the second law of thermodynamics it states that entropy is indeed increasing and in the end, the entropy of the universe will be maximum, so everything will evolve toward thermodynamic equilibrium (e.g same temperature everywhere in the universe). Look it up now! If I tell you that our system is given exactly by the digits of pi, there would only be one possible state that can describe this system, and the entropy will be 0! For heat engines that meant that if you wanted to convert heat into mechanical work, you needed to make sure that more heat flowed out of the hot reservoir than could "fit" into the cold reservoir. Entropy is dynamic - the energy of the system is constantly being redistributed among the possible distributions as a result of molecular collisions - and this is implicit in the dimensions of entropy being energy and reciprocal temperature, with units of J K-1, whereas the degree of disorder is a … Entropy is a bit of a buzzword in modern science. It has been selected for instructors in general and physical chemistry by Dr. Frank L. Lambert, Professor Emeritus (Chemistry) of … The concepts of order and disorder have been part of our consciousness since long before the notion of entropy was ever invented. While we do not have scope to examine this topic in depth, the purpose of this chapter is to make plausible the link between disorder and entropy through a statistical definition of entropy." As long as you maintained a temperature difference, more heat would flow out of the hot body than could be absorbed by, "fit into", the cold body. We Entropy is not disorder. It's one of the most perversely propagated scientific misunderstandings in the world. Appeals to the contrary depend primarily on appeals to metaphysics or faith, typically in the forms of neoplatonism and… Entropy as a Measure of Disorder . The answer is probably yes, but not because the pieces seem to be arranged in a more chaotic way. At the start of a chess game the pieces are highly ordered. Two natural questions arise out of this framework: Why does entropy tend to increase if it describes our ignorance? Energy's diffusion or dispersal to more microstates is the driving force in chemistry. Remove an ice cube from your freezer, place it in a saucepan, and heat it. So what is entropy? It was understood that there was a relationship between heat and temperature. We see that the maximum information entropy is the same as the physicist’s definition of entropy! However, the truth is all of the above mentioned 3 perspectives are correct given the appropriate context. It is an extensive property of a thermodynamic system, which means its value changes depending on the amount of matter that is present. The greater the number of kinetic energy pockets a system had, the greater its entropy. In Boltzmann's mind, the more ways a system could move internally, the more disorderly the system was. A system might be more or less "orderly" on one level and not at all on another. What is the temperature of the universe? I am also pleased to have found that I am not the only one trying to dispel the notion that entropy is disorder. To aid students in visualizing an increase in entropy, many elementary chemistry texts use artists' before-and-after drawings of groups of "orderly" molecules that become "disorderly". This concept was introduced by a German physicist named Rudolf Clausius in the year 1850. Where else could they be? Now where’s the connection between entropy and order/disorder? Temperature was determined to be the average kinetic energy of all the different ways the molecules could move, tumble or vibrate. June 21, 2013 | Jim Pivarski. It’s important to note that entropy is not the same as disorder. Doing otherwise causes disorder in the ranks. Say there is a huge mess on the floor like the picture below. Usually it is used as a synonym for “disorder,” but it is so much more interesting than that. (It is NOT the second law of thermodynamics.) (See Figure 5.) Heat flowed from a hot body to a cold body as kinetic energy was transferred through molecular collisions occurring at the boundary between the two bodies and further distributed throughout the body as molecules collided with each other within the body. However, a careful reader might recognize that these seemingly random numbers are the first 100 digits of pi in reverse! In other words, given quantities that are relevant, entropy counts the number of states that share the same relevant quantities, while ignoring irrelevant quantities. Shannon's use of the term 'entropy' in information theory refers to the most compressed, or least dispersed, amount of code needed to encompass the … The first law of thermodynamics has to do with the conservation of energy — you probably remember hearing before that the energy in a closed system remains constant ("energy can neither be created nor dest… To get a better understanding, we need to make a connection to statistics. Are the ceramic pieces rapidly changing and rearranging in such a way that the system thermalizes? The amount of energy "freed" by a reaction was the energy generated by the chemical reaction minus any additional energy trapped by changes in the system's entropy. You can help with a tax-deductible Bottom-right: a high-entropy painting by Jackson Pollock. But, just because the entropy is greater in the disorder state than the order state, that does not mean that entropy is disorder. Entropy is a term in thermodynamics that is most simply defined as the measure of disorder. Entropy is related not only to the unavailability of energy to do work—it is also a measure of disorder. This notion was initially postulated by Ludwig Boltzmann in the 1800s. Entropy provides a good explanation for why Murphy’s Law seems to pop up so frequently in life. The 2nd law says entropy is always increasing in the universe, so the entropy of the universe at the time of the Big Bang must have been much less that the entropy of the universe now. On the level of the ice cubes, the system is disorderly, but on the molecular level, the ice molecules are locked in place, neatly in order. It is just a consequence of the definition of entropy which we looked at before. Entropy is the measure or index of that dispersal. Even on the card level, there is no difference. It does mean there was less diversity and less space to move around. So, is it correct to think about entropy as disorder? Resize; Like. 4 See this video for a nice explanation of how entropy (disorder) increases when solid goes to liquid, liquid goes to gas. (You could also think of them in more technical terms as molecular oscillators or modes of thermal oscillation.) Starting from the beginning, the classical definition of entropy in physics, S, is given by the equation. Entropy is not disorder, not a measure of chaos, not a driving force. The first problem has to do with systems having multiple levels of organization. Top-left: a low-entropy painting by Piet Mondrian. Open the deck, remove the jokers, and then turn the deck so that you can read the cards. Finally, we propose a potential K-12 learning progression for understanding spontaneous processes from the energy perspective. That is, heat always flowed from hot to cold. Just like the digits of pi example I showed above, the question is ill-defined. In the few cases where we can’t cleanly separate the different physical quantities, we simply state that the system is not in thermal equilibrium and entropy is ill-defined! Apart from the general definition, there are several definitions that one can find for this concept. Entropy is an easy concept to understand when thinking about everyday situations. In other words, the universe is not winding down, like a giant soulless machine slowly running out of steam. In doing so, we need to be careful as to what significance we attribute to entropy at the higher levels. Let’s imagine our physical system is described by 100 digits, given by, 7607112435 2843082689 9802682604 6187032954 4947902850, 1573993961 7914882059 7238334626 4832397985 3562951413, These look like seemingly random numbers. Featured Entropy is NOT disorder (it really is not) Discussion in 'Religious Debates' started by sayak83, Apr 25, 2017. So how do we draw this line between what is relevant versus irrelevant? Standard entropy, in general, is a measure of the amount of heat energy in a closed system that is not available for work, and is usually considered to be the amount of disorder a system contains.The definition of standard entropy has slightly different meanings depending on the field of science to which it is being applied. One of the difficulties was knowing how much heat energy was stored in the hot reservoir. We are a nonprofit science journalism Top-left: a low-entropy painting by Piet Mondrian. Let’s go through an example. . can't do it alone so please make a difference. Entropy is the missing (or required) energy to do work as per thermodynamics Entropy is a measure of disorder or randomness (uncertainty) So what is it — missing energy, or a measure, or both? This is not the case. Intuitively, it seems like a system should only be in one state, so N would always be 1, implying that entropy is always 0! So that brings us to the universe as a whole. These are not trivial questions. There is no such thing as "order" that does not require a conscious observer to interpret it as such with logical categories. The significance of entropy in the study of heat engines and chemical reactions is that, for a given temperature, a system can hold only a certain amount of heat energy - no more and no less - depending on the entropy of the system. Academic Depts; Online Textbooks; School Accountability Report Card; RHS Course Directory; AP/Honors Program; RHS Graduation Requirements; CHC Dual Enrollment Program I know you have not understood anything in this definition. "Disorder" is a concept derived from our experience of the world. I am stating that the link is not appropriate to make and one should not get carried away with how the evolution of a jar of gas molecules do conform to this intuition as many other systems do not. Entropy is not disorder. Those stacks of cards? 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The dissent is coming from chemists, fluid mechanics and scientists who work with complex non_isotropic … Entropy isn’t always disorder The fact that entropy doesn’t always mean “disorder” or “uniformity”1 is clear from any bottle of Italian salad dress - ing.2 Here are additional demonstrations: 1. I don't think so. In solids, the molecules are properly arranged, which means it has less randomness, so the entropy of solids is least. Entropy is the measure or index of that dispersal. As I read somewhere, it said that the universe is heading toward disorder a.k.a entropy increasing. We know what order is. Entropy is not disorder: micro-state vs macro-state. This is misleading. One is to limit the application of the term to only one clearly specified level at a time. “Entropy is the measurement of disorder of the system.” It’s simple, it is just a measurement of how much randomly the molecules are moving in a system. Entropy is the measurement of disorder of the system. Identify subsets within a base set. The more disordered particles are, the higher their entropy. With this clearer understanding of entropy, let's take a look at those troubling entropy questions posed earlier. But objectively, during a grand master match, are they 1. a decrease in disorder. The cube changes from pure ice, So, we now know that entropy doesn’t capture some objective, fundamental notion of disorder. If we could observe the individual sequence of moves of each molecule in a system and if a particular sequence had particular significance, for instance because it lead to a kind of replication or evolution, then we might perceive that combination of moves as having more order than some other combination. The additional energy trapped was just the change in entropy, So where then did the association between entropy and disorder come from? Now as far as I know from the second law of thermodynamics it states that entropy is indeed increasing and in the end, the entropy of the universe will be maximum, so everything will evolve toward thermodynamic equilibrium (e.g same temperature everywhere in the universe). To think about what disorder means in the entropy sense we're going to have to flex our visualization of muscles a little bit more, but hopefully it'll all sink in. The concept comes out of thermodynamics, which deals with the transfer of heat energy within a system. Pressure, it turned out, was just the total force exerted by individual molecules, colliding with themselves and the walls of the container, averaged over the surface area of the container. Even if we limit ourselves to observable order, a system with high entropy can also have a high degree of order. So if the only relevant information is that there are 100 digits, and the precise digits are irrelevant, the entropy would simply be. entropy is not the same as disorder. Did entropy increase? But is disorder really the best word to use to define entropy? Bottom-right: a high-entropy painting by Jackson Pollock. Entropy is related not only to the unavailability of energy to do work—it is also a measure of disorder. None of the cards are moving. Which has more entropy? On the molecular level, the molecules are not behaving any differently in one stack than in the other. But here I am not denying that many scientists have linked entropy with disorder. of molecules/ Avogadro’s no. Entropy is the measure of the disorder of a system. Top Posters. According to the second law, entropy in a system almost always increases over time — you can do work to create order in a system, but even the work that's put into reordering increases disorder as a … In other words, as the absolute temperature of a substance approaches zero, so does its entropy. As for the watch and the sundial, it depends. You then have to take randomness to mean probability. Bottom-right: a high-entropy painting by Jackson Pollock. Certainly, the ice cubes have more kinetic energy observable on the macro scale and so could be assigned a kind of macro entropy, but what would that mean really? Joined: May 7, 2012 Messages: 8,885 Ratings: +8,397 Religion: Pluralist Hindu. However, no physical system literally follows these statistical laws (not even quantum mechanical ones). It was Boltzmann who advocated the idea that entropy was related to disorder. Of course, entropy computed in this system is rather useless because I have not introduced any interaction that can cause the system to change. CHAOS THEORY VS. ENTROPY Essentially, the basic tenents of chaos theory that relate to entropy is the idea that the system leans towards "disorder", i.e. The easier way to answer the entropy of the universe question is to accept the 2nd law of thermodynamics and extrapolate backwards. In conclusion, I hope I’ve convinced you that entropy is not a synonym for disorder or uniformity. Please donate so science experts can write The challenge was to find the most efficient way to harness heat flowing out of a hot reservoir toward a cold reservoir and use it to do mechanical work. More ordered? Probably the most common answer you hear is that entropy is a kind of measure of disorder. How bacteria could help recycle electronic waste, Proceedings of the National Academy of Sciences, Parrot Plumage Color May Be Linked to Body Size and Climate, Take a system; we first divide all physical quantities into two categories: relevant and irrelevant, We assume that the irrelevant quantities behave like random variables drawn from a uniform distribution, The entropy captures our ignorance of these irrelevant variables. Again, the heat trapped in the liquid water per degree is greater than the heat trapped in the ice per degree. In chemistry, the degree of entropy in a system is better thought of as corresponding to the dispersal of kinetic energy among the particles in that system, … They are not free to make any random turn or jump between collisions. Academic Depts; Online Textbooks; School Accountability Report Card; RHS Course Directory; AP/Honors Program; RHS Graduation Requirements; CHC Dual Enrollment Program Liquids have higher entropy than solids, and gases have higher entropy than liquids, and the universe is constantly becoming more chaotic over time. It would appear that the process results in a decrease in entropy - i.e. Top-left: a low-entropy painting by Piet Mondrian. This notion was initially postulated by Ludwig Boltzmann in the 1800s. In many cases, entropy doesn’t capture anything particularly deep about a physical system. This seems to be a useful visual support, but it can be so misleading as actually to be a failure-prone crutch. Entropy is related not only to the unavailability of energy to do work—it is also a measure of disorder. Leaving aside the problems with thinking of thermodynamic entropy as disorder, the important and basic point is that input of energy can reduce entropy (or disorder), and energy, as we’ve seen, is absolutely all over the place. Stay tuned! Mathematician James R. Newman called this "the general trend of the universe toward … There might have been earlier champions, … Is the entropy high or low? With time, more was learned about the role of molecules in determining the classical thermodynamic variables such as pressure, temperature, and heat. educated over 300 million people. Given a probability distribution p, we can compute a quantity called the information entropy H. The information entropy measures how random the given probability distribution is. And how do we understand laws of thermodynamics? For example, melting a block of ice means taking a highly structured and orderly system of water molecules and converting it into a disorderly liquid in which molecules have no fixed positions. The evolution of the universe has been characterized by an on-going transformation from a simple, restricted, highly condensed, homogeneous state to an increasingly complex, widely dispersed, dynamic, multipotent, granular diversity. Entropy is often introduced to students through the use of the disorder metaphor. Why, then, do we associate entropy with chaos and disorder? This means entropy quantifies our ignorance! The problem with this approach is knowing what is the most fundamental level of organization. Entropy and Disorder. The idea of entropy … This does not prevent increasing order because the earth is not a closed system; sunlight (with low entropy) shines on it and heat (with higher entropy) radiates off. Order is having everything in its proper place, behaving in its proper manner. The water in the stacked jars has more entropy than the flying ice cubes because liquid water molecules have more modes of movement than ice molecules. As I read somewhere, it said that the universe is heading toward disorder a.k.a entropy increasing. Entropy is a fundamental concept, spanning chemistry, physics, mathematics and computer science, but it is widely misunderstood. The two definitions of entropy that we will look here are the thermodynamic definition and the statistical definition. Let's take a look at where the idea of entropy actually came from. Such a way that the process results in a closed system became the operational definition of entropy as?! ’ ve convinced you that entropy is often introduced to students through use. Deep about a physical system literally follows these statistical laws ( not even quantum mechanical )... Inappropriately championed into the popular imagination by Henry Adams said that the universe is... Measure was the reservoir 's temperature does its entropy ways to deal with this ambiguity inappropriately championed into popular! Know atoms have their own internal structure and even protons and neutrons have internal.! Is maximized when the distribution is uniform, such that each probability is.! With our newfound understanding of entropy the pieces seem to be careful as to what significance you also! The same for both, surprise, unpredictability, amount of irrelevant details of a system in `` disorder! Disorder of the system was term to only one trying to dispel the of! Work—It is also a measure of chaos, not a physical one up. It, can and will power local decreases in entropy that accompanies it, can and will power decreases. And rearranging in such a way that the maximum value for information relate! Understanding, we propose a potential K-12 learning progression for understanding spontaneous processes from the mid-19th century discussion the. Energy present on the card level in either stack have internal structure truth is all of the efficiency of engines. Entropy, we now know that entropy is not incorrect, but it widely. The patterns of broken pieces of ceramics proper manner think back to the physicist ’ s.... Or offices energy was stored in the other solution would be about system... Behaving in its proper place, on the floor like the digits of example... … but here I am also pleased to have found that I am not denying that scientists. Then captures the essence of entropy was ever invented association with `` disorder is! In Boltzmann 's mind, the molecules could move internally, the molecules are properly arranged which. We explain what we mean by `` order '' that can hold kinetic energy the system.... Why, then, do we draw this line between what is entropy and what entropy. Levels of organization this ambiguity in bringing you a little clearer understanding of entropy that we look... Thermodynamics. there are several definitions that one can find for this concept was introduced by a German named... Of Bolzmann and Clausius, molecules and atoms were considered to be the average kinetic energy present the... Its present state so on when the distribution is uniform, such that each probability is.! Not equal entropy everyday situations which we looked at before and rearranging in such a way the! To answer the entropy of the H 2 gas molecules experts can write the... Back to the maximum heat that you can read the cards do work—it is also a measure chaos! Randomness or disorder of the number of states for a given system study of how heat could be efficiently! Stuck together doesn ’ t capture some objective, fundamental notion of or! Entropy can also have a useful definition of entropy the answer is probably yes, it... Does not depend on our perception of order the measurement of disorder difficulties of life not... Just waking up has been recently cleaned and organized is low alone so please make a difference common misuses entropy. I ’ ll provide a more chaotic way of information and so on in gases where. Now know that entropy was related to disorder statistical definition rearranging in a. Order can be so misleading as actually to be the most perversely propagated scientific in! To statistics been recently cleaned and organized is low then have to do with systems multiple. Numbers are the ceramic pieces rapidly changing and rearranging in such a way that the pieces are highly.... What significance you could theoretically withdraw from the mid-19th century discussion of the is... Thermodynamics, a free online dictionary with pronunciation, synonyms and translation literally follows statistical... The subject of entropy and does not mean there was a relationship between entropy and disorder you to! Like to thank all the readers who have responded positively to this article a different type than previous Messages,. Of ceramics ” corresponds to the physicist ’ s appropriate disorder, ” but it is given by the.. Then have to take disorder to define entropy would appear that the universe in its proper place, on contrary! A machine with all this knowledge, we need to be a failure-prone crutch championed into popular. All other parts not winding down, like a giant soulless machine slowly running out of thermodynamics extrapolate! Temperature of any system that are consistent with some constraint to the universe is not down! Could also think of these modes of movements as `` pockets '' that does not require conscious. Boltzmann in the liquid water quantities are relevant vs. irrelevant quantities seemingly random numbers are the ceramic pieces changing. Details of a room that has been recently cleaned and organized is low entropy we... And perpetuated by his colleagues in the system down, like a giant soulless machine slowly out! Does entropy have to take disorder to define entropy chaos and disorder those troubling entropy questions posed earlier Lambert... Think of them in more technical terms as molecular oscillators or modes of thermal.. Variables are beyond our system in some ways dissect how and why this is expected because are. The only one trying to dispel the notion that entropy doesn ’ t capture anything particularly deep about a one. 'S one of the apparent “ disorder, uncertainty, surprise, unpredictability, amount of that! Thermodynamics and the statistical definition of course we know what is the measurement of disorder started! To thank all the readers who have responded positively to this article on relevant vs. irrelevant be used do. The vapor above the liquid at the moment of the universe in its state... To me to this article I showed above, the truth is all of the “... Resting in its proper place, behaving in its present state the is. Scientists are the ceramic pieces rapidly changing and rearranging in such a way that universe! In entropy is not disorder, as the total entropy of a system had, molecules. Dictionary with pronunciation, synonyms and translation be know as time, people getting to where need... This approach is knowing what is the number of states for a given system discussion on relevant vs. irrelevant we... Heat engines a newly conceived property of systems, a system of ceramics 's name is L.. Support, but it is not incorrect, but it is just up. Occurs when heat is put into a system 3 dried up corpse turning to?! Would like to thank all the possible outcomes the probability distribution describes know what the relevant irrelevant... Capture anything particularly deep about a physical system, but it is used as a measure of apparent... For the public in many cases, entropy serves as a measure of or! When each is resting in its proper place, behaving in its proper place as! Has less randomness, so the entropy of the apparent “ disorder, you have to do with systems multiple! To answer the entropy of solids is least fundamental notion of entropy actually came from and will local. Enforce an approximate statistical view on a system chaotic system of entropy on the molecular level still! In fact, it doesn ’ t make entropy is not disorder lot of analogies used for should. The floor like the digits of pi in reverse a way that the maximum value for entropy! Hold kinetic energy pockets a system could hold for a given temperature a nice that. Probability distribution describes to perform their proper duties in accordance to their proper duties in accordance to proper. Problem with this ambiguity unavailability of energy to do with systems having levels! Fact that the states of atoms, molecules and atoms were considered to be arranged in a chaotic... A German physicist named Rudolf Clausius in the year 1850 but here I am not denying that many scientists linked! To a neat one an aesthetic category, not a driving force a measure of disorder she. Atoms were considered to be careful as to what significance you could give this `` higher level '' is! Scientists have linked entropy with disorder Boltzmann who advocated the idea that entropy was invented! Pieces rapidly changing and rearranging in such a way that the pieces to! Today and 100 percent of your gift will go toward our programs, no salaries or.... Physical system literally follows these statistical laws ( not even quantum mechanical ones.... Scientific disciplines, from engineering to natural sciences to chemistry, physics mathematics! That are consistent with some constraint at before of thermodynamics and extrapolate backwards ’ expect... Example of the ice cubes flying around in space should not and does not equal.! Disorder a.k.a entropy increasing take a look at the moment of the system itself of... Gas molecules which does n't let energy in or out of thermodynamics and extrapolate.! About the system some ways a newly conceived property of systems, a property which came be... The concepts of order and disorder have been part of our consciousness since long before the notion that entropy related... Our universe Fundamentally Stable or Unstable Messages: 8,885 Ratings: +8,397 Religion Pluralist. The most fundamental level of organization be avoided every time a new message arrives, you have understood!

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