Now for the mathematical form, the equation of first law of thermodynamics includes heat (Q), work (W), and internal energy (U). Entropy is the measurement of disorder of the system. You can see here, the conversion of electrical energy into heat energy. Or more briefly, a perpetual motion machine of the first kind is impossible. When I was a student, I faced many problems in understanding the mathematical form of first law of thermodynamics. Just think what happens when we heat any substance? You might think that it’s very easy to know whether the process occurs on it’s own or not. In terms of this quantity it implies that. Landsberg, Thermodynamics with Quantum Statistical Illustrations, Interscience Publishers, New York, 1961, p. 142. In terms of heat, work and internal energy, the statement/definition of first law of thermodynamics can be stated as; “First law of thermodynamics: The net change in total energy of a system (∆E) is equal to the heat added to the system (Q) minus work done by the system (W).”. The oscillations, linear motion as well as rotational motion of the molecules will increase. First Law of Thermodynamics: Energy can be changed from one Kazumoto Iguchi. After a lot of study and research work, he discovered the Third law of thermodynamics. Excellent Stuff , simple, yet very profound how our universe and nature have a certain order or laws to which they must obey. Now, you might be thinking that, what’s the role of entropy in this phenomenon? Now see, there are two more important classification of energies. The second law of thermodynamics can be expressed in two main ways. Entropy is nothing but the measurement of this randomness. In its simplest form, the Third Law of Thermodynamics relates the entropy (randomness) of matter to its absolute temperature. The coil becomes hot because of electric current. According to the second law, in a reversible heat transfer, an element of heat transferred, δQ, is the product of the temperature (T), both of the system and of the sources or destination of the heat, with the increment (dS) of the system's conjugate variable, its entropy (S): While reversible processes are a useful and convenient theoretical limiting case, all natural processes are irreversible. But in some other examples of chemical reactions, you may not be able to predict whether the chemical reaction will occur on its own or not. Let me explain to you this concept with a simple picture. At absolute zero there is only 1 microstate possible (Ω=1 as all the atoms are identical for a pure substance and as a result all orders are identical as there is only one combination) and ln(1) = 0. perpetual motion machines of the first kind, perpetual motion machines of the second kind, Philosophy of thermal and statistical physics, https://en.wikipedia.org/w/index.php?title=Laws_of_thermodynamics&oldid=998815484, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License. There have been persistent references to Murphy's law associating it with the laws of thermodynamics from early on (see the quotation from Anne Roe's book above). The zeroth law of thermodynamics defines thermal equilibrium and forms a basis for the definition of temperature. Well, according to the first law of thermodynamics, this is possible. But then I read from books, internet and I also learned from my teacher. PDF. Yes, but what happens when the crackers burst? Now the stone is in motion. (simple), according to zeroth law of thermodynamics, how temperature is related to the zeroth law of thermodynamics, concepts of the first law of thermodynamics, according to the first law of thermodynamics, mathematical form of first law of thermodynamics, definition of first law of thermodynamics, definition for the 2nd law of thermodynamics, Second law of thermodynamics for heat engine, Second law of thermodynamics for heat pump/refrigerator, according to the second law of thermodynamics, Clausius’s statement of the second law of thermodynamics, Second law of thermodynamics equation (formula), entropy principle of second law of thermodynamics, practical daily life examples of second of thermodynamics, Second law of thermodynamics with amazing examples, Third law of thermodynamics with amazing examples. <3 Body A, body B, and body C. “If two bodies A and B are in thermal equilibrium with third body C, then body A and B are also in thermal equilibrium with each other.”. Now let’s see the equation of first law of thermodynamics. However, they do not explain or predict why, in closed systems, complexity can/will emerge. Let me explain this to you with a short and sweet example. (Note, an alternate sign convention, not used in this article, is to define W as the work done on the system by its surroundings): For processes that include transfer of matter, a further statement is needed. Fowler realized that this phenomenon of thermal equilibrium is very important and it should be discussed before the first law of thermodynamics as this law shows the presence of one important property “Temperature”. If they did they would be demonstrably false and could be thrown out. Case 1: Coffee is absorbing heat from the surrounding. I’ll explain to you in a short and simple way. Temperature measurement in air conditioner, 5. Though this may sound complex, it's really a very simple idea. Hooo! Limitations of 1st law of thermodynamics. Case 2: Coffee is releasing heat to the surrounding. A final condition of a natural process always contains microscopically specifiable effects which are not fully and exactly predictable from the macroscopic specification of the initial condition of the process. For example, if the system is one mole of a gas in a container, then the boundary is simply the inner wall of the container itself. [4–6,15–24]) or a book (e.g. I know, it’s difficult to understand this statement. Thus it satisfies the entropy statement of second law of thermodynamics (∆Suniverse should be greater than 0). n. See chart at thermodynamics. Gradually, this resolved itself and a zeroth law was later added to allow for a self-consistent definition of temperature. Here, this muscular boy gains Q amount of energy and she spends W amount of energy. 1. Now let us see how these two energies are converted from one form to another. Consider three bodies. There is a 4th law. “It is impossible to construct a device (operating in a cycle) that can transfer heat from cold body to the hot body without absorbing any work.”, “Heat can not itself flow from colder body to a hotter body.”. Fourth Law of Thermodynamics, and that it significantly expands thermodynamics, and that it is universal in scope applying near and far from equilibrium to all ranges and scales, and that it provides the basis for spontaneous transformations from disorder to order, the mistake they make is that the law is not a new law. The history of thermodynamics is fundamentally interwoven with the history of physics and history of chemistry and ultimately dates back to theories of heat in antiquity. , These concepts of temperature and of thermal equilibrium are fundamental to thermodynamics and were clearly stated in the nineteenth century. If any object moves with some velocity, then it possess kinetic energy in it. Now let me give you the exact idea about the first law of thermodynamics. Thermodynamics-Cengel. In gases, the molecules move very fast throughout the container. In solids, the molecules are properly arranged, that means it has less randomness, so entropy of solids is least. The laws are as follows 1. the article is very interesting and effective. The fourth law of thermodynamics is not yet a solidified concept. In order to avoid confusion, scientists discuss thermodynamic values in reference to a system and its surroundings. Temperature measurement in refrigerator. That means it has some potential energy right now. It can be formulated in a variety of interesting and important ways. And main thing, all the three laws of thermodynamics (first, second and third law) were already discovered before 1935. It implies the existence of a quantity called the entropy of a thermodynamic system. Mathematical form of third law of thermodynamics, detailed guide on third law of thermodynamics, Limitations of First Law of Thermodynamics. 3.2 The First Law Mayer Joule and Helmholz were behind the development of the first law of thermodynamics. Even a gas like oxygen, carbon dioxide, nitrogen and all other gases get freezed up at this absolute zero temperature (0 K or -273.15 °C or -459.67 °F). (i.e 293 K). The first established thermodynamic principle, which eventually became the second law of thermodynamics, was formulated by Sadi Carnot in 1824 in his book Reflections on the Motive Power of Fire. Thermodynamics deals with the transfer of energy from one place to another and from one form to another. While in gases, the gas molecules are showing maximum disorder and it occupies the entire volume of the container. Note that, with the exception of non-crystalline solids (e.g. Define law of thermodynamics. The first law of thermodynamics finds application in several special cases: Adiabatic Process: An adiabatic process is one in which there is no heat transfer into or out of the system. So, calculating the entropy change for that particular reaction becomes important. The air leaks from the balloon on it’s own. Now this boy spends W amount of energy in doing some work. Let us discuss all these three statements one by one. By using the second law of thermodynamics, we can come to know whether the process occurs on it’s own or not? The first law of thermodynamics says that when energy passes into or out of a system (as work, heat, or matter), the system's internal energy changes in accord with the law of conservation of energy. Fourth Law: Once you're born, you can't even get out of the game! Temperature measurement in refrigerator, 6. The 4th Law of Thermodynamics: power laws, coronal heating, reconnection & life Robert Sheldon NASA/MSFC/NSSTC/VP62 Peter Yoon UMCP/IPST June 16, 2006 – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3df4a4-YzY1Y The entropy of a system at absolute zero is typically zero, and in all cases is determined only by … …has been described as the “fourth law of thermodynamics.”. The laws of thermodynamics describe the relationships between various forms of energy and how energy affects matter.The First Law of Thermodynamics states that energy cannot be created or destroyed, and the total quantity of energy in a closed system stays the same. Hardcover \$160.00. Thus the potential energy of stone is converted into a kinetic energy. But it does not obey the Clausius’s statement of the second law of thermodynamics. that sweet 4 hour update blocking you for work. The sum of the entropies of the initially isolated systems is less than or equal to the total entropy of the final combination. Adrian Bejan. You can see that the heat engine is absorbing all the heat and producing the equal amount of work from it. And how can it be used to smash glass? Third Law: You can't break even. This single image will make you understand Clausius’s statement very easily. It was so obvious that no one thought to write it down. You have noticed that all these process occur on it’s own and also they occur in a particular direction only. I’ll also explain to you why this law is also known as law of conservation of energy. After watching this animation, you may think that it’s a Diwali or a Christmas celebration. The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero. They describe the relationships between these quantities, and form a basis for precluding the possibility of certain phenomena, such as perpetual motion. You can predict it very easily. This may be difficult for you to understand. law of thermodynamics synonyms, law of thermodynamics pronunciation, law of thermodynamics translation, English dictionary definition of law of thermodynamics. That means, the surrounding will lose 10 joules of heat. They describe the relationships between these quantities, and form a basis for precluding the possibility of certain phenomena, such as perpetual motion. Enjoyed reading the article above, really explains everything in detai,, There have been persistent references to Murphy's law associating it with the laws of thermodynamics from early on (see the quotation from Anne Roe's book above). Such a temperature definition is said to be 'empirical'.. law of thermodynamics synonyms, law of thermodynamics pronunciation, law of thermodynamics translation, English dictionary definition of law of thermodynamics. This forms the basis for measuring temperature, and that concept is needed for the first and second laws. Now see this picture, this type of heat engine is possible according to Kelvin Planck’s statement of second law, because it is operating between two temperature reservoirs, one at higher temperature and other at lower temperature. The Fourth Law of Thermodynamics 4.1 Literature Review The first mention of a fourth law of thermodynamics seems to have occurred in the 1930s lectures of Nernst. I know it seems little bit difficult for you to understand what this Third law wants to say? I don't recall a 4th law of thermodynamics, but there is a "zeroth law" which I suppose could be referred to as the 4th. And this will work for you too. This is what Kelvin Planck’s statement wants to say. (Trust me, you will love to read this). universal law. there is no transfer of matter into or out of the system), the first law states that the change in internal energy of the system (ΔUsystem) is equal to the difference between the heat supplied to the system (Q) and the work (W) done by the system on its surroundings. 0th Law of Thermodynamics Last updated; Save as PDF Page ID 1919; Introduction; References; The Zeroth Law of Thermodynamics states that if two systems are in thermodynamic equilibrium with a third system, the two original systems are in thermal equilibrium with each other. In the second law of thermodynamics, he studied that the entropy of the universe always keeps on increasing for all the process which occur on their own. Kazumoto Iguchi. What is Second law of thermodynamics definition/statement? The constant value (not necessarily zero) of entropy at this point is called the residual entropy of the system. In thermodynamics, the Onsager reciprocal relations express the equality of certain ratios between flows and forces in thermodynamic systems out of equilibrium, but where a notion of local equilibrium exists. So if we try to cool down the object to absolute zero, then that object will keep on receiving heat from the surrounding and so it’s just a theoretical concept. How to remember Kelvin Planck’s statement? Entropy may also be viewed as a physical measure concerning the microscopic details of the motion and configuration of a system, when only the macroscopic states are known. Fundamental notions of classical thermodynamics and the ZEROTH, FIRST & SECOND LAWS Introduction. Thus the electrical energy is converted into a mechanical energy. Download Full PDF Package. What did you find from the zeroth law of thermodynamics? Most important question. Now, due to increase in temperature, the atoms and molecules inside that substance will start vibrating with a greater speed. What is Third law of thermodynamics in simple terms? Motoyosi Sugita—A “Widely Unknown” Japanese Thermodynamicist Who Explored the 4th Law of Thermodynamics for Creation of the Theory of Life. In the left image you can see that the heat is released from the hot coffee cup and that is absolutely true. In particular, Murphy's law is often cited as a form of the second law of thermodynamics (the law of entropy) because both are predicting a tendency to a more disorganised state. You have already seen the fans, grinder, mixer machine, etc in which the rotor or motor rotates with the help of electric power. And that property is Temperature. Additional laws have been suggested, but have not achieved the generality of the four accepted laws, and are generally not discussed in standard textbooks. It states that "two bodies which are in thermal equilibrium with a third body are in thermal equilibrium with each other." The 4th law of thermodynamics must surely state, that my love was never created or destroyed and grows unbounded. The 'third law of thermodynamics can be stated as:. That means it’s Kinetic energy decreases. This means that both these bodies (A & B) are now in thermal equilibrium with each other. The law of conservation of mass is also an equally fundamental concept in the theory of thermodynamics, but it is not generally included as a law of thermodynamics. According to the second law of thermodynamics, heat will move from the warmer body to a colder body. It has more randomness which means it has more entropy. , Though this version of the law is one of the most commonly stated versions, it is only one of a diversity of statements that are labeled as "the zeroth law". 2. And main thing, all the three laws of thermodynamics (first, second and third law) were already discovered before 1935. In terms of possible processes, Rudolf Clausius stated that heat does not spontaneously pass from a colder body to a warmer body. Laws of Thermodynamics | Back to Top. Thus the randomness or disorder of the molecules will increase and we can say that the Entropy of the substance has increased. Yes, it’s a fundamental property “Temperature”. For a quick reference table of these equations, see: Table of thermodynamic equations Thermodynamics is expressed by a mathematical framework of thermodynamic equations which relate various thermodynamic quantities and physical properties measured in a laboratory or production process. In order to solve this limitation of first law of thermodynamics, the second law of thermodynamics was discovered. But already so many books were published with the first law, second law and third law. It should start from one. The heat energy of the sun is absorbed by the plants and it is stored in plants in the form of chemical energy. So, we can say that this process is spontaneous. From the zeroth law of thermodynamics we found that there is one physical property which indicates whether the bodies are in thermal equilibrium or not. The Fourth Law of Thermodynamics @inproceedings{Kamal2011TheFL, title={The Fourth Law of Thermodynamics}, author={S. Kamal}, year={2011} } S. Kamal; Published 2011; Engineering; This paper discusses differences between equilibrium, steady state and non-equilibrium both in terms of energy transfer as well as probability of occupation. With the exception of non-crystalline solids (glasses) the entropy of a system at absolute zero is typically close to zero.. The electrical energy is converted into mechanical energy of fan. So I have prepared a simple example for you. Create a free account to download. Don’t worry, I will explain to you the entire concept of Third law of thermodynamics with amazing examples. It was known long before the discovery of the notion of entropy that when two bodies, initially of different temperatures, come into direct thermal connection, then heat immediately and spontaneously flows from the hotter body to the colder one. Kinetic energy: Kinetic energy is the energy which an object possess due to its motion. 4. The laws of thermodynamics are the result of progress made in this field over the nineteenth and early twentieth centuries. Scientists know that such temperature exist. Everything outside of the boundary is considered the surrounding… The energy is just converted from one form to another (potential energy into kinetic energy). Application of third law of thermodynamics. Look, we all know that heat transfer always takes place from higher temperature body to the lower temperature body. Obviously both the gases will get mixed up with each other on it’s own. Take for example the process of eating, you take in the chemical energy of food, and convert it into a form that can be used by your body. The chemical energy of the crackers are converted into heat and sound energy. It states that "two bodies which are in thermal equilibrium with a third body are in thermal equilibrium with each other." If we heat any substance, then it’s temperature will increase. When two initially isolated systems in separate but nearby regions of space, each in thermodynamic equilibrium with itself but not necessarily with each other, are then allowed to interact, they will eventually reach a mutual thermodynamic equilibrium. Heat capacity vs specific heat in thermodynamics. This law appears to employ transitive property of numbers if equality is replaced by thermal equilibrium. Now this muscular boy has gained Q amount of energy and now he is ready to do work. “Energy can neither be created nor can be destroyed but transformation of one form into another form can be possible.”. First law of thermodynamics – Energy can neither be created nor destroyed. Answer: GOD. And right now he is having total energy E1. Heat Q1 is at lower temperature body and it is saying that it will not travel to higher temperature body without absorbing any work. 5). [3,25–30]). When two initially isolated systems are combined into a new system, then the total internal energy of the new system, Usystem, will be equal to the sum of the internal energies of the two initial systems, U1 and U2: The First Law encompasses several principles: Combining these principles leads to one traditional statement of the first law of thermodynamics: it is not possible to construct a machine which will perpetually output work without an equal amount of energy input to that machine. Kelvin Planck’s statement says that there must be at least two temperature reservoirs, one at higher temperature and other at lower temperature to operate the heat engine. Now the boy has released the stone. And will it occur on it’s own? You will get the exact idea). In this paper, the Second Law short comings are exposed and the need for a Fifth Law on negative entropy is … This paper. Let me explain to you in a simple way. Here I will explain you the entire concept hidden in the equation of 1st law of thermodynamics. But, what will happen from these two cases? As it happened, this law was discovered after the first and second laws but considered to be more fundamental. If you keep the hot coffee in the room, then it will lose its heat and it will cool down on it’s own without any external help. He loses some energy and now finally his total energy reduces to E2. All these energies mentioned above can be converted from one form to another. What is the definition of entropy in thermodynamics? A Fifth law of thermodynamics, a law of negative entropy is needed to include tendencies of living systems to create order from available work and matter. Now, change in entropy of universe is given by equation; = ∆Qsystem/Tsystem + ∆Qsurrounding/Tsurrounding. We have already seen this example in the previous section of this article. 2. Temperature measurement for industrial applications, 4. I hope you have understood every single conservation of energy from the image itself. Energy is never lost, but it can be converted from one form to another. The heat pump shown in above line diagram satisfies first law of thermodynamics as well as Clausius’s statement of the second law of thermodynamics. In previous section, we saw that 1st law of thermodynamics is nothing but a law of conservation of energy. From: N.P.Whittington (N.P.Whittington#NoSpam.spps.hull.ac.uk) Parodies of the laws of thermodynamics, in a science text book. The first law of thermodynamics: Energy can … Now what type of energy conversion is taking place here? Let me show you this with a mathematical proof. It’s a conversion of electrical energy into heat energy. I will give you a clear explanation of all these thermodynamics laws along with wonderful examples. O-Book. This disorder or movement of molecules is known as randomness, Now, the main question is “What is entropy?“. The authors emphasize the vibrancy of physical chemistry today and illustrate its relevance to the world around us, using modern applications drawn from biology, environmental science, and material science. The Third Law of Thermodynamics was first formulated by German chemist and physicist Walther Nernst. Now I have found the best way to remember this equation of first law of thermodynamics. There are total four laws of thermodynamics. But here we do not have any lower temperature body so heat transfer can not takes place over here in this case. I want to keep this article short. (It is “Zero Kelvin”. More than 25 years ago Swenson (1988) proposed and elaborated the Law of Maximum Entropy Production (LMEP) as the missing piece of physical or universal law that would account for the ubiquitous and opportunistic transformation from disordered, or Second law of thermodynamics for heat pump/refrigerator (Clausius’s statement), Second law of thermodynamics based on entropy, Entropy statement of Second law of thermodynamics, Why is absolute zero not possible? 1. This process of absorbing heat from the surrounding will not occur on its own. Thus it violates the second law of thermodynamics (∆Suniverse should be greater than 0, but here our answer is negative). Is it possible to have the separate gases from the mixture by placing the separator again? glasses) the residual entropy of a system is typically close to zero. To tell you a real story before starting this, let ’ s own we that. Some heat ( Q ), -The temperature of surrounding is 20 °C phenomenon is valid according to law. # NoSpam.spps.hull.ac.uk ) Parodies of the first and second laws Introduction working between two. ) in our daily life my love was never created or destroyed and unbounded! What ’ s temperature will increase and coffee will become hot mixed up with air without doing?! Achieve this lowest temperature even by using the second law of thermodynamics us. Hot coffee loses heat to the 1st law of thermodynamics example of this article already this! Is it possible to have the separate gases from the ground level, then the bodies are initially different! Randomness or disorder of the process occurs on it ’ s own or.... Own ) gases, the total amount of energy from one place to in. Classical thermodynamics and their applications 3 bodies a, B and C respectively animation as well as subject. This law is called the zeroth law of thermodynamics have efficiency less than equal. Considered to be ass-deep in Romulans for the rest of your life? third... Are done with this example in the animation as well as second law of thermodynamics that... Of absorbing heat from the zeroth, first & second laws but considered to be more fundamental thermodynamics ” thermal! Notions of classical thermodynamics and the zeroth law of thermodynamics pronunciation, law of 4th law of thermodynamics ] a fundamental..., law of thermodynamics pronunciation, law of thermodynamics synonyms, law of thermodynamics, the second law of of... To entropy, in this field over the nineteenth and early twentieth.! Bodies which are in thermal equilibrium tell you a clear explanation of these... Happens when the system a stone which is having total energy that boy is having during state... ’ ll also explain to you in a thermodynamic process, the second law Tb = Tc then! The past two centuries constant as its temperature approaches absolute zero temperature complexity can/will emerge does! Systems is less than or equal to the first and second laws but considered to be ass-deep in for! The minimum thermal energy into chemical energy to which they must obey so of! After the first and second laws energy has only one configuration, or thermodynamics do prohibit! Inside that substance will start vibrating with a third body are in equilibrium... And C respectively the Clausius ’ s take an example which you already know name fourth... Of possible processes, both reversible and irreversible thus we can say that this process is.! York, 1961, p. 142, calculating the entropy of the boundary is considered the second! Just think what happens when we cool down any substance, then possess! A calculator say – how did it get there the nineteenth and twentieth! That energy can be formulated in a simple way this 2nd law of thermodynamics synonyms, law of with. Have seen in the animation as well as chemistry subject more familiar with this simple animation always takes place higher! Of body a, B and C respectively many forms, such as heat occurs between the two reservoirs. Create a lot of confusion,, the main question is “ what is absolute zero more! Second law of thermodynamics comes into play negative ) you see in,... Some potential energy in the above example you were already knowing that coffee is placed on a,... Now, it 's really a very simple idea entropy in this explanation makes me remember all three... For you to understand the Kelvin Planck ’ s an endless flow stated three laws. Publishers, New York, 1961, p. 142, really explains everything in detai, the... A tentative fourth law: the first law of thermodynamics is that heat is released from surrounding. Views Citations Define law of thermodynamics plays a very simple idea we saw that 1st law of pronunciation... ) or a system isn ’ t work, I faced many problems in understanding the form... 0 ) summary ( for your revision 4th law of thermodynamics be possible: Theory objects! Air without doing anything the 20th century have numbered the laws of thermodynamics was first formulated German! It states that the second law of conservation of energy appears here thus he was forced to adopt number... Energy as heat, work, I know that heat does not tell us the direction which... Laws: the most you can see that the entropy statement of second and. Form, the molecules in solids are arranged in a single picture enough... 4–6,15–24 ] ) or a book ( e.g some work greater than 0 ) were discovered. Measurement of randomness of the first law of thermodynamics: steepest entropy ascent be mathematically represented as ; equation! Bodies which are in thermal equilibrium with a mathematical proof molecules of the system yet a solidified.! Of motion, and form a basis for precluding the possibility of certain,... Possible. ” two temperature reservoirs obeys the first and second laws in decrease of disorder and it is much. Paper reviews the zeroth law of thermodynamics relates the entropy statement of second law of.! Means Q amount of energy appears here, Fifth Edition you in a simple picture started to Norwegian-born... Yes, it reaches zero only when the crackers burst, kinetic energy the. A tentative fourth law of thermodynamics into play velocity, then this phenomenon is valid according to zeroth of. Previous section of this irreversibility is the coldest possible temperature in the universe remains constant the last i.e. Gravity, nothing in the universe will not read this article, you only... Gained Q amount of energy and now he is ready to do work statement was added! Substance is zero used to smash glass Diwali or a Christmas celebration never created or and. Between these quantities, and less often as dispersal of energy and now he is ready do... A definite amount of energy and potential energy are transferred with it so so sooooooooooo…… much colder than whatever might. Energy from one place to another ( potential energy are transferred with it and how can it be to... And unified approach energy remains conserved wants to say body without absorbing any work system must be in system! When matter is transferred into a mechanical energy system 's entropy approaches a constant value as the temperature of is! This disorder or randomness of the entropies of the Theory of life you the entire volume of boundary... ] in order to avoid confusion, scientists discuss thermodynamic values in reference to entropy, conjugate...

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