- Entropy is a tendency for a systems' outputs to decline when the inputs have remained the same. Most often associated with the Second Law of Thermodynamics, entropy measures the changes in the type and dispersion of energy within an observable system
- Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy provides deep insight into the direction of spontaneous change for many everyday phenomena
- Entropy is the measure of the disorder of a system. It is an extensive property of a thermodynamic system, which means its value changes depending on the amount of matter that is present. In equations, entropy is usually denoted by the letter S and has units of joules per kelvin (J⋅K −1) or kg⋅m 2 ⋅s −2 ⋅K −1
- In thermodynamics, entropy is a numerical quantity that shows that many physical processes can go in only one direction in time. For example, you can pour cream into coffee and mix it, but you cannot unmix it; you can burn a piece of wood, but you can't unburn it. The word 'entropy' has entered popular usage to refer a lack of order or predictability, or of a gradual decline into disorder. A more physical interpretation of thermodynamic entropy refers to spread of energy or matter, or to ex
- 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. In solids, the molecules are properly arranged, which means it has less randomness, so the entropy of solids is least. In gases, the molecules move very fast throughout the container
- Entropy is a measure of the number of ways a thermodynamic system can be arranged, commonly described as the disorder of a system. This concept is fundamental to physics and chemistry, and is used in the Second law of thermodynamics, which states that the entropy of a closed system (meaning it doesn't exchange matter or energy with its surroundings) may never decrease
- Total entropy change, ∆S total =∆S surroundings +∆S system. Total entropy change is equal to the sum of entropy change of system and surroundings. If the system loses an amount of heat q at a temperature T1, which is received by surroundings at a temperature T2. So,∆S total can be calculated ∆S system =-q/T 1 ∆S surrounding =q/T 2 ∆S total =-q/T1+q/T

- Entropy is the amount of disorder in a system. According to the Second Law of Thermodynamics, the total entropy of an isolated system can only increase over time. This has some interesting implications
- BSI Entropy Software helps you to get the most from your business and management systems. It provides a software and management solution to help you proactively manage risk, sustainability, and performance, by reducing the cost and effort that goes into these activities, while improving the overall visibility within your organization
- Entropy is the extensive property of the system (depends on the mass of the system) and its unit of measurement is J/K (Joule per degree Kelvin). Entropy is heat or energy change per degree Kelvin temperature. Entropy is denoted by 'S', while specific entropy is denoted by 's' in all mathematical calculations
- Entropy is dynamic - something which static scenes don't reflect Thermodynamics deals with the relation between that small part of the universe in which we are interested - the system - and the rest of the universe - the surroundings
- In cryptography, entropy refers to the randomness collected by a system for use in algorithms that require random data. A lack of good entropy can leave a cryptosystem vulnerable and unable to encrypt data securely. For example, the Qvault app generates random coupon codes from time to time
- Probability gives a local picture of the whole system. In order for us to get a sense of the whole system, we need to come up with a way that tells us a global picture of the whole system. We need to evaluate the parts of the system and see their effect in summation

a total differential of the function of state S called entropy (the differential definition of entropy). The entropy difference of a system in two arbitrary states A and B (defined, for example, by the values of temperature and volume) is equal to (the integral definition of entropy) Since the concept of entropy applies to all isolated systems, it has been studied not only in physics but also in information theory, mathematics, as well as other branches of science and applied. View full lesson: http://ed.ted.com/lessons/what-is-entropy-jeff-phillipsThere's a concept that's crucial to chemistry and physics. It helps explain why phys..

Entropy is a way of quantifying how likely the system's current microstate is. A coin is a very good analogy. Its macrostate is its shape, size, color, temperature Entropy is a property of state. Therefore, the change in entropy ΔS of a system between two states is the same no matter how the change occurs. The total change in entropy for a system in any reversible process is zero. Key Terms. Carnot cycle: A theoretical thermodynamic cycle. It is the most efficient cycle for converting a given amount of. In statistical physics, entropy is a measure of the disorder of a system. What disorder refers to is really the number of microscopic configurations, W, that a thermodynamic system can have when in a state as specified by certain macroscopic variables (volume, energy, pressure, and temperature)

Entropy is central to the spontaneity of a process. If a process has an increase in entropy (such as the two situations described above) then it will happen on its own. If a process has a decrease.. In the theory of dynamical systems, entropy quantifies the exponential complexity of a dynamical system or the average flow of information per unit of time. In sociology, entropy is the natural decay of structure (such as law, organization, and convention) in a social system. In the common sense, entropy means disorder or chaos He defined entropy as an internal property of the system that changes as the heat energy moves around in a system. Mathematically, it is written as ΔS = ΔQ/T. For an ideal Carnot cycle, the change in entropy is zero, but it is positive for any other idealized system Entropy definition is - a measure of the unavailable energy in a closed thermodynamic system that is also usually considered to be a measure of the system's disorder, that is a property of the system's state, and that varies directly with any reversible change in heat in the system and inversely with the temperature of the system; broadly : the degree of disorder or uncertainty in a system **Entropy** **is** the measure of disorder: the higher the disorder, the higher the **entropy** of the **system**. Reversible processes do not increase the **entropy** of the universe. However, irreversible **systems**.

- Entropy is a measure of the energy dispersal in the system. We see evidence that the universe tends toward highest entropy many places in our lives. A campfire is an example of entropy. The solid wood burns and becomes ash, smoke and gases, all of which spread energy outwards more easily than the solid fuel. Ice melting, salt or sugar dissolving, making popcorn and boiling water for tea are.
- Entropy is a term from physics that refers to the amount of disorder in a system. Unfortunately, the laws of thermodynamics guarantee that the entropy in the universe tends toward a maximum. When disorder increases in software, programmers call it software rot
- 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. In chemistry, standard molar entropy is defined as the entropy of 1.
- The American Heritage Science Dictionary defines entropy as a measure of disorder or randomness in a closed system. The definition claims that as a system becomes more disordered, its energy becomes more evenly distributed and less able to do work, leading to inefficiency. Business organizations are either organic or.

Entropy is the measure of disorder: the higher the disorder, the higher the entropy of the system. Reversible processes do not increase the entropy of the universe. However, irreversible systems. Software entropy refers to the tendency for software, over time, to become difficult and costly to maintain.A software system that undergoes continuous change, such as having new functionality added to its original design, will eventually become more complex and can become disorganized as it grows, losing its original design structure Entropy is a measure of the random activity in a system. The entropy of a system depends on your observations at one moment. How the system gets to that point doesn't matter at all. If it took a billion years and a million different reactions doesn't matter. Here and now is all that matters in entropy measurements * Entropy is the quantitative measure of spontaneous processes and how energy disperses unless actively stopped from doing so*. Entropy is highly involved in the second law of thermodynamics: An isolated system spontaneously moves toward dynamic equilibrium (maximum entropy) so it constantly is transferring energy between components and increasing its entropy

- 3.2 THERMODYNAMIC ENTROPY. Entropy is one of the most important concepts in physics and in information theory. Informally, entropy is a measure of the amount of disorder in a physical, or a biological, system. The higher the entropy of a system, the less information we have about the system. Hence, information is a form of negative entropy
- A Temperature-entropy diagram (T-s diagram) is the type of diagram most frequently used to analyze energy transfer system cycles. It is used in thermodynamics to visualize changes to temperature and specific entropy during a thermodynamic process or cycle
- A closed system is one that is not taking in any energy from the outside. In other words, unless you add outside energy to keep things orderly, the natural trend of any closed system is to become more disordered. The Nature of the Physical World (1915). Chapter 4. For scientific nitpickers: you will never be able to reverse entropy in the long run
- d survive terrible things and had to work to work together to get through it
- In other words, systems made up of interacting subsystems have a higher floor for entropy production than a single, uniform system. All entropy that is produced is heat that needs to be dissipated.
- Exothermic because entropy of system is already negative as order increases from gas to liquid or solid, therefore for total entropy to be +ve, entropy of surroundings must be more positive than entropy of system is -ve. For entropy of surroundings to be positive, delta H must be -ve I.e exothermi
- Entropy is a measure of the number of possible arrangements the atoms in a system can have. The entropy of an object can also be a measure of the amount of energy which is unavailable to do work

* Entropy is a software system designed to help you manage quality, environmental, and health and safety standards, and supply chain compliance*. Only Entropy offers an on-demand solution that meets the varied needs of everyone from small businesses to large, global organisations Introduction to Cross Entropy . The moment we hear the word Entropy, it reminds me of Thermodynamics. In entropy, the momentum of the molecules is transferred to another molecule, the energy changes from one form to another, entropy increases. Well, what does that mean? There is a disorder in the system Entropy as a scientific principle concerns the loss of energy from a system or how an ordered system moves toward disorder. The point to understanding entropy is that it cannot be stopped, and to maintain a desired level of order or energy, more of the same must be added into the system

Entropy describes the tendency for systems to go from a state of higher organization to a state of lowest organization on a molecular level. In your day-to-day life, you intuitively understand how entropy works whenever you pour sugar in your coffee or melt an ice cube in a glass ** Entropy is a crucial microscopic concept for describing the thermodynamics of systems of molecules**, and the assignment of entropy to macroscopic objects like bricks is of no apparent practical value except as an introductory visualization Entropy (S) is a state function that can be related to the number of microstates for a system (the number of ways the system can be arranged) and to the ratio of reversible heat to kelvin temperature. It may be interpreted as a measure of the dispersal or distribution of matter and/or energy in a system, and it is often described as. Entropy refer to the second law of thermodynamic (in Physics). It states that, for a closed, independent system, the amount of disorder doesn't decrease overtime. It can stay stable or increasing. The idea of software entropy was coined by the book Object-Oriented Software Engineering. Basically, more a software change, more its disorder, its.

Entropy is a measure of information. If you are thinking — earlier he said entropy is a measure of disorder or randomness (uncertainty) and now it has been morphed into a measure of information — then this means you are paying attention Entropy coding is a type of lossless coding to compress digital data by representing frequently occurring patterns with few bits and rarely occurring patterns with many bits. Huffman coding is a type of entropy coding Entropy means an increase of disorder or randomness in natural systems, and negative entropy means an increase of orderliness or organization. Negative entropy is also known as negentropy. Individual systems can experience negative entropy, but overall, natural processes in the universe trend toward entropy Entropy as a Measure of the Multiplicity of a System. The probability of finding a system in a given state depends upon the multiplicity of that state. That is to say, it is proportional to the number of ways you can produce that state. Here a state is defined by some measurable property which would allow you to distinguish it from other states Thermodynamic entropy is a measure of how organized or disorganized energy is present in a system of atoms or molecules.It is measured in joules of energy per unit kelvin. Entropy is an important part of the third law of thermodynamics.. Imagine that a group of molecules has ten units of energy. If the energy in those molecules is perfectly organized, then the molecules can do ten units of work

There are probably as many definitions of entropy as there are people who try to define it! But there are two very distinct - but ultimately consistent - ways of talking about entropy. From a statistical viewpoint, entropy is a measure of disord.. Entropy Entropy is a measure of randomness or disorder of the system. The greater the randomness, higher is the entropy. Solid state has the lowest entropy, the gaseous state has the highest entropy and the liquid state has the entropy in between the two. Entropy is a state function. The change in its value during [

One aspect of entropy that has not received much attention is that it is a measurable property for any system in thermodynamic equilibrium—i.e., a system's entropy has a definite numerical value when its temperature, pressure, volume, and the like are unchanging and there is no energy or matter flowing through it The entropy of gas in a box may be very high, but with respect to the solar system it is very low. Sheep-dogs often decrease the entropy of sheep, by taking them off hills and putting them in to pens. So entropy is relative to constraints, and so is the second law. To understand entropy fully, we need to understand those constraints Entropy is a state function. The unit of ΔS is J K-1 mol-1. Entropy and Spontaneity: In most of the cases, the entropy of a system increases in a spontaneous process. But there are some spontaneous processes in which it decreases

• Entropy is an extensive property, and thus the total entropy of a system is equal to the sum of the entropies of the parts of the system. An isolated sys-tem may consist of any number of subsystems (Fig. 1). A system and its surroundings, for example, constitute an isolated system since both can be enclosed by a sufficiently large arbitrary. • Entropy measurement in Thermodynamics is nearly as simple as energy measurement: energy in a control-mass system increases when work or heat is added (thing on a pistoncylinder system with - trapped air, and how work and heat can be measured); system entropy does not change when work is added 'smoothly', and it increases in the amount d. S. What is entropy? We try to explain it to ya!Why is it that disorder in our lives always seems to be increasing? No matter how much we try to maintain order,.. Entropy is the quantitative measure of this spontaneous process. This also means that p rocesses must proceed in a direction in which the generated entropy of the system increases. The entropy change of a system can be negative but the generation of entropy must be positive

Entropy in social work is the disorder within a social system. Social workers often assist people with problems, which can be seen as chaos. Also,.. * (2) The entropy of the LiBr(aq) is less than the entropy of the water*. (3) The dissolving of the LiBr(s) in water is an endothermic process. (4) The dissolving of the LiBr(s) in water is an exothermic process. Jan 2007-27 In terms of energy and entropy, systems in nature tend to undergo changes toward (1) higher energy and higher entropy

thermodynamic systems. Entropy exists in all systems, nonliving and living, that possess free energy for doing work. As system energy declines, entropy increases. Entropy has precise mathematical and statistical definitions, but can be approximately defined as the degree of disorder or uncertainty in a system. If a system is isolated, o ** Thermodynamics - Thermodynamics - Entropy and heat death: The example of a heat engine illustrates one of the many ways in which the second law of thermodynamics can be applied**. One way to generalize the example is to consider the heat engine and its heat reservoir as parts of an isolated (or closed) system—i.e., one that does not exchange heat or work with its surroundings So the sun's entropy, if you view it as a system. If you view the sun as a system, it's entropy is way higher than the moon. It's entropy is much larger than the entropy of the moon. Think about it, how much information you would need. You would need a lot of information if someone wanted to tell you where every molecule or every atom on the.

The second law of thermodynamics states that the entropy of an isolated system never decreases, because isolated systems always evolve toward thermodynamic equilibrium, a state with maximum entropy The entropy of a system can in fact be shown to be a measure of its disorder and of the unavailability of energy to do work. Making Connections: Entropy, Energy, and Work. Recall that the simple definition of energy is the ability to do work. Entropy is a measure of how much energy is not available to do work Information theory is a subfield of mathematics concerned with transmitting data across a noisy channel. A cornerstone of information theory is the idea of quantifying how much information there is in a message. More generally, this can be used to quantify the information in an event and a random variable, called entropy, and is calculated using probability

* Open system: Physical system that has external interactions*.-wiki. Closed system: A closed system is a physical system that does not allow the transfer of matter in or out of the system.-wiki. Entropy is a quantity directly associated with heat transfer, not mass transfer. I have cited an interpretation for it below In practice, however, all exchanges of energy are subject to inefficiencies, such as friction and radiative heat loss, which increase the entropy of the system being observed All entropy that is produced is heat that needs to be dissipated, and so is energy that needs to be consumed. So a better understanding of how subsystem networks affect entropy production could be very important for understanding the energetics of complex systems, such as cells or organisms or even machiner

Entropy is simply a quantitative measure of what the second law of thermodynamics describes: the spreading of energy until it is evenly spread. The meaning of entropy is different in different fields. It can mean: Information entropy, which is a measure of information communicated by systems that are affected by data noise ** Define entropy**. entropy synonyms, entropy pronunciation, entropy translation, English dictionary definition of entropy. n. pl. en·tro·pies 1. Symbol S For a closed thermodynamic system, a quantitative measure of the amount of thermal energy not available to do work. Entropy increases as the system's temperature increases. For example. Standard molar entropy is defined as the entropy or degree of randomness of one mole of a sample under standard state conditions. Usual units of standard molar entropy are joules per mole Kelvin (J/mol·K). A positive value indicates an increase in entropy, while a negative value denotes a decrease in the entropy of a system

entropy [en´trŏ-pe] 1. in thermodynamics, a measure of the part of the internal energy of a system that is unavailable to do work. In any spontaneous process, such as the flow of heat from a hot region to a cold region, entropy always increases. 2. the tendency of a system to move toward randomness. 3. in information theory, the negative of. Negentropy is reverse **entropy**.It means things becoming more in order. By 'order' is meant organisation, structure and function: the opposite of randomness or chaos.One example of negentropy is a star **system** such as the Solar **System**.Another example is life.. As a general rule, everything in the universe tends towards **entropy**. Star **systems** eventually become dead Entropy is a degree of uncertainty. The level of chaos in the data can be calculated using entropy of the system. Higher entropy indicates higher uncertainty and a more chaotic system Entropy is a measure of the degree of the spreading and sharing of thermal energy within a system. The entropy of a substance increases with its molecular weight and complexity and with temperature. The entropy also increases as the pressure or concentration becomes smaller. Entropies of gases are much larger than those of condensed phases * Entropy is a measure of the disorder in a closed system*. 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 byproduct — usually in the form of heat

Entropy. From microscopic point of view, the entropy of system increase whenever the thermal randomness of system increases. Thus entropy can be defined as measure of thermal randomness or molecular disorder, which increases anytime when system goes under process In this equation, S is the entropy of the system, k is a proportionality constant equal to the ideal gas constant divided by Avogadro's constant, ln represents a logarithm to the base e, and W is the number of equivalent ways of describing the state of the system. According to this equation, the entropy of a system increases as the number of. ** It is the measure of disordernes of a system**. We cant measure exact entropy at a particular state point of a system. We can only measure change in entropy of a system. Generally entropy at 0K is taken to be Zero and with that reference change in e..

The entropy of system is the average heat capacity of the system averaged over its absolute temperature. The Significance of Entropy in Classical Thermodynamics 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. Software entropy is the tendency for an instance of installed software to decline in quality with time. Second Law of Thermodynamics A principle of physics known as the Second Law of Thermodynamics states that the total entropy of an isolated system increases over time

Entropy is technically defined here and is the second law of thermodynamics.The technical explanation of entropy in computing terms is described here. Simply put, entropy as it relates to digital information is the measurement of randomness in a given set of values (data) 6. 5 Irreversibility, Entropy Changes, and ``Lost Work'' . Consider a system in contact with a heat reservoir during a reversible process. If there is heat absorbed by the reservoir at temperature , the change in entropy of the reservoir is .In general, reversible processes are accompanied by heat exchanges that occur at different temperatures Later, entropy was described by Ludwig Boltzmann based on the statistical behavior of the microscopic components of the system. According to this, entropy is a measure of the number of possible microscopic configurations of the atoms and molecules (individually) in accordance with the macroscopic state of the system In physics, entropy is a law; in social systems, it's a mere tendency — though a strong one, to be sure. Entropy occurs in every aspect of a business. Employees may forget training, lose enthusiasm, cut corners, and ignore rules. Equipment may break down, become inefficient, or be subject to improper use. Products may become outdated or be.

- Entropy and Open Systems BY HENRY M. MORRIS, PH.D. | FRIDAY, OCTOBER 01, 1976. The most devastating and conclusive argument against evolution is the entropy principle. This principle (also known as the Second Law of Thermodynamics) implies that, in the present order of things, evolution in the vertical sense (that is, from one degree of order.
- Boltzmann proposed that, for an isolated (constant energy) system, \(S\) and \(W\) are related by the equation \(S=k{ \ln W\ }\), where \(k\) is Boltzmann's constant. This relationship associates an entropy value with every population set. For an isolated macroscopic system, equilibrium corresponds to a state of maximum entropy
- Any Linux system, on a single-board computer or on your high-powered workstation, pulls entropy from the last few digits in the timestamp of interrupts fired off by keyboard, mouse, disk drive, or.
- This video begins with observations of spontaneous processes from daily life and then connects the idea of spontaneity to entropy. Entropy is described as a measure of the number of possible ways energy can be distributed in a system of molecules. Students apply this description to understand the entropy change in a heat diffusion experiment

- What is entropy? At this level, in the past, we have usually just described entropy as a measure of the amount of disorder in a system. A very regular, highly ordered system (diamond, for example) will have a very low entropy. A very disordered system (a mixture of gases at a high temperature, for example) will have a high entropy
- of entropy which are relevant to chemical reactions. In classical thermodynamics, e.g., before about 1900, entropy, S, was given by the equation ∆S = ∆Q/T where ∆S is the entropy change in a system, ∆Q is heat energy added to or taken from the system, and T is the temperature of the system. The units for entropy
- Entropy is a measure of randomness. Much like the concept of infinity, entropy is used to help model and represent the degree of uncertainty of a random variable . It is used by financial analysts.
- One could deliberately set up a system in a state with a smaller entropy, but it would approach the state with the largest entropy as it comes to equilibrium. ** We'll also assume that no work is done on/by either system, so we don't need to account for integral of PdV-type factors
- In order to account for spontaneity or directionality of processes, the concept of entropy is defined and incorporated into what is known as the second law of thermodynamics. Roughly speaking, entropy (symbolized S) is a quantitative measure of the number of ways that energy can be distributed within a system.Entropy can be defined and measured as a thermodynamic quantity
- The temperature of the system is an explicit part of this classical definition of entropy, and a system can only have a temperature (as opposed to several simultaneous temperatures) if it is in thermodynamic equilibrium. So, entropy in classical thermodynamics is defined only for systems which are in thermodynamic equilibrium

- Entropy is a state function that is often erroneously referred to as the 'state of disorder' of a system. Qualitatively, entropy is simply a measure how much the energy of atoms and molecules become more spread out in a process and can be defined in terms of statistical probabilities of a system or in terms of the other thermodynamic quantities
- imum number of bits you need to fully describe the detailed state of the system So forget about statements like entropy is disorder , entropy measures randomness and all vagaries about teenage bedrooms getting messy that inundate the internet
- The definition explicitly requires the system in question to be isolated. This is a non trivial observation. If the system were not isolated, then entropy could pour out over the boundary, and the entropy decrease instead of increase. The 2nd Law in Nonequilibrium Systems
- The entropy of the system never reduces. In the ideal process it can remain remain constant, but in actual process the entropy of system and universe always increases. Let us why the entropy of the universe always increases and its relation to second law of thermodynamics. Lets us relation between entropy and second law of thermodynamics
- If two systems each undergo a change in entropy $\Delta S_i$, then the combined system undergoes a change in entropy $\Delta S_1 + \Delta S_2$. Fermi comments that this is not always valid, but is if 'the energy of the system is the sum of the energies of all the parts and if the work performed by the system during a transformation is equal to.

Entropy measures the probability¹ of a macrostate. The more likely the macrostate, the higher the entropy. Changes in entropy relate temperature to changes in internal energy. If you can find out how likely each macrostate is, you can then find out how the system responds to changes in temperature and internal energy In science, Entropy is defined as a loss of energy in human systems, and makes the tendency of that system to become increasingly disorganized and less efficient due to gradual energy loss within the system. Entropy or the loss of energy is what makes a system break down, fall apart, instigate chaos, and function far less efficiently. Understanding how the concept of entropy works from micro. Entropy rises while the refrigerant is in the evaporator, and it falls while the refrigerant is in the condenser. Entropy slightly decreases and increases during the expansion phase, and it stays constant in the compressor. A T-S diagram like the one shown below shows how entropy changes in the system along with the temperature The Linux kernel's entropy calculation corresponds to an information-theoretic model of entropy which is not relevant to practical use. The only case where this is relevant is on a new device which has never had time to accumulate entropy (this includes live distributions; installed systems save their entropy from one boot to the next) Entropy (S) is a state function and the change in the entropy of both the system and surroundings gives us important conclusions regarding a system or reaction. The Universe has positive entropy which means that the entropy of the universe is increasing: Order to Disorder. In irreversible or spontaneous processes:.

Ph.D in Entropy. What is the entropy change of the system when two moles of an ideal diatomic gas is carried through the process N-R-P-Y as shown in the pV diagram. The temperatures at points N, R, and Y are Ty = 360 (K), TR = 600 [K] and Ty = 360 (K), respectively A. -66.9 B. 6.74 patm 5 The entropy of this system is the sum of the entropies of the two parts: . Suppose the partition is taken away so the gases are free to diffuse throughout the volume. For an ideal gas, the energy is not a function of volume, and, for each gas, there is no change in temperature. (The energy of the overall system is unchanged, the two gases were. Entropy increase of the demon is sure to be greater than entropy lowering of the gas. The discourse between pro- and anti-demon theorists reached a new level in the 1960s when it was proposed that an act of measurement may not necessarily increase entropy in a closed system provided that the measuring process could be thermodynamically reversible