Thermodynamic potentials and their applications

thermodynamic potentials and their applications

Thermodynamic potentials are used to measure the energy of a system in terms of different variables because often we can only measure certain properties of the system. For example we might know the pressure and temperature of system but not the volume or the entropy.

Thermodynamic potentials allow us to measure more state variables of the system. The first column of the first row contains just the internal energy Uto obtain the enthalpy, we must add P V. We wish to have a number of expressions for the energy of a system in terms of different variables, for we shall sometimes know the pressure and temperature of a system, but not the volume or entropy; or we might know the volume and temperature but not the pressure and entropy.

In most cases, we shall know only a few relevant quantities and will wish to find out many more. This leads to the following definitions two or more thermodynamic quantities:. From the first and second laws of thermodynamics, dU and dQ are not obviously measurable. Therefore we need thermodynamic manipulation to get useful properties from what is measurable, i. Thermodynamics quantities are more commonly defined in terms of partial differentials.

For example:. Do you have any Physics Questions? Ask them at the Splung Physics Forum. Site Search. Thermodynamic Potentials Thermodynamic potentials are used to measure the energy of a system in terms of different variables because often we can only measure certain properties of the system. These different potentials can be remembered by writing them in the form of a grid. For example: Internal Energy Enthalpy Helmholtz Free Energy Gibbs Free Energy Example of Thermodynamic Potentials Good examples of thermodynamic potentials include electrolysis or They are thermodynamic potentials because each can be found as a result of differentiating.

Forum Help with Physics.Thermodynamics is considered to be one of the most important parts of our day-to-day life. Whether you are travelling in any vehicle, sitting comfortably in your air-conditioned room, watching television etc, you will notice the applications of thermodynamics almost everywhere directly or indirectly.

When Sadi Carnotthe boy considered to be the father of thermodynamics, proposed theorem and cyclehardly anybody had imagined that his proposals will play such a major role in creation of automobiles that would become one of most important parts of the human life. The development of almost all types of engines can be traced to the Carnot Theorem and Carnot Cycle.

At this stage of our life can we imagine the life without automobiles. Of course one cannot forget the importance of StirlingDieselOtto and Ericsson also created their own independent cycles that resulted in more innovations and betterment of the automobiles. The study of these laws of thermodynamics help unravel numerous mysteries of the nature, not only for materialistic achievement, but also for gaining spiritual wisdom, for a number of these laws like the third law related to entropy helps understanding the secrets of existence of the human life.

To understand various concepts of thermodynamics some important terms related to thermodynamics have to be understood. The study of the thermodynamics involves system and surroundings where all the experimentation is done for the discovery of the device. There are various types of thermodynamic processes that help implementing thermodynamic laws for various thermodynamic applications.

The thermodynamical potentials in the theory of relativity and their statistical interpretation,

All types of vehicles that we use, cars, motorcycles, trucks, ships, aeroplanes, and many other types work on the basis of second law of thermodynamics and Carnot Cycle. They may be using petrol engine or diesel enginebut the law remains the same.

All the refrigeratorsdeep freezers, industrial refrigeration systems, all types of air-conditioning systemsheat pumpsetc work on the basis of the second law of thermodynamics. One of the important fields of thermodynamics is heat transferwhich relates to transfer of heat between two media.

There are three modes of heat transfer: conductionconvection and radiation. The concept of heat transfer is used in wide range of devices like heat exchangers, evaporators, condensers, radiators, coolers, heaters, etc.

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Thermodynamics also involves study of various types of power plants like thermal power plantsnuclear power plantshydroelectric power plantspower plants based on renewable energy sources like solarwindgeothermaltideswater waves etc.

Renewable energy is an important subject area of thermodynamics that involves studying the feasibility of using different types of renewable energy sources for domestic and commercial use. The list of the applications of thermodynamics is very long and if you want to mention the individual applications, these can be infinite.

Thermodynamics involves the study of infinite universe and it indeed has infinite applications. No other field of study is as closely associated to human life as thermodynamics.

For me the study of thermodynamics is the path to salvation.

thermodynamic potentials and their applications

Page content. Applications of Thermodynamics.Most of the theoretical physics known today is described by using a small number of differential equations. For linear systems, different forms of the hypergeometric or the confluent hypergeometric equations often suffice to describe the system studied.

There are important examples, however, where one has to use higher order equations. Heun equation is one of these examples, which recently is often encountered in problems in general relativity and astrophysics.

For these equations whenever a power series solution is written, instead of a two-way recursion relation between the coefficients in the series, we find one between three or four different ones. An integral transform solution using simpler functions also is not obtainable. The use of this equation in physics and mathematical literature exploded in the later years, more than doubling the number of papers with these solutions in the last decade, compared to time period since this equation was introduced in up to We use SCI data to conclude this statement, which is not precise, but in the correct ballpark.

Here this equation will be introduced and examples for its use, especially in general relativity literature, will be given. If we study only linear systems, different forms of the hypergeometric or the confluent hypergeometric equations often suffice to describe the system studied.

Such an equation was proposed by Karl Heun in [ 1 ]. This equation and its confluent forms become indispensable in general relativity if one studies exact solutions of wave equations in the background of certain metrics. A well-known example is the Kerr metric [ 2 ]. Although it is possible to solve the wave equations in the background of some metrics in terms of hypergeometric functions or its confluent forms, this is not possible for the much studied Kerr metric. If we also study even the trivially extended forms of some metrics by adding a flat dimension to the existing metric, we may have to solve the Heun equation to obtain the exact solution.

Here we will introduce the Heun equation and its confluent forms and mention some of the properties of the Heun equation. Then we will give some examples in physics, mainly in gravitational physics, where one can find many recent papers. This part is meant to be a survey of the work done in the field of General Relativity and Quantum Gravity concentrating on the last decades.

In another section we will give an example where the Heun equation emerges from a trivial extension of a wave equation in the background of the Eguchi-Hanson instanton metric [ 3 ]. We will end with some concluding remarks. Let us review some well-known facts about second-order differential equations. Differential equations are classified according to their singularity structure [ 45 ]. If a differential equation has no singularities over the full complex plane, it can only be a constant.

Singularities are classified as regular singular and irregular singular points. If the coefficient of the first derivative has at most single poles and the coefficient of the term without a derivative has at most double poles when the coefficient of the second derivative is unity, this second-order differential equation has regular singularities, which gives us one regular solution while expanding around this singular point.

In general the second solution has a pole or a branch point singularity. If the poles of these coefficients are higher, we have irregular singularities and the general solution has an essential singularity [ 6 ].

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As stated in Morse and Feshbach [ 4 ] an example of a second-order differential equation with one regular singular point is This equation has one solution which is constant.Please choose whether or not you want other users to be able to see on your profile that this library is a favorite of yours. Finding libraries that hold this item You may have already requested this item.

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thermodynamic potentials and their applications

Please enter the message. Please verify that you are not a robot. Would you also like to submit a review for this item? You already recently rated this item. Your rating has been recorded. Write a review Rate this item: 1 2 3 4 5.Thermodynamics is a branch of physics that deals with heatworkand temperatureand their relation to energyradiationand physical properties of matter.

The behavior of these quantities is governed by the four laws of thermodynamics which convey a quantitative description using measurable macroscopic physical quantitiesbut may be explained in terms of microscopic constituents by statistical mechanics.

thermodynamic potentials and their applications

Thermodynamics applies to a wide variety of topics in science and engineeringespecially physical chemistrychemical engineering and mechanical engineeringbut also in other complex fields such as meteorology. The initial application of thermodynamics to mechanical heat engines was quickly extended to the study of chemical compounds and chemical reactions. Chemical thermodynamics studies the nature of the role of entropy in the process of chemical reactions and has provided the bulk of expansion and knowledge of the field.

Statistical thermodynamicsor statistical mechanics, concerns itself with statistical predictions of the collective motion of particles from their microscopic behavior.

A description of any thermodynamic system employs the four laws of thermodynamics that form an axiomatic basis. The first law specifies that energy can be exchanged between physical systems as heat and work. In thermodynamics, interactions between large ensembles of objects are studied and categorized.

Central to this are the concepts of the thermodynamic system and its surroundings. A system is composed of particles, whose average motions define its properties, and those properties are in turn related to one another through equations of state.

Properties can be combined to express internal energy and thermodynamic potentialswhich are useful for determining conditions for equilibrium and spontaneous processes.

With these tools, thermodynamics can be used to describe how systems respond to changes in their environment. This can be applied to a wide variety of topics in science and engineeringsuch as enginesphase transitionschemical reactionstransport phenomenaand even black holes.

The results of thermodynamics are essential for other fields of physics and for chemistrychemical engineeringcorrosion engineeringaerospace engineeringmechanical engineeringcell biologybiomedical engineeringmaterials scienceand economicsto name a few.

This article is focused mainly on classical thermodynamics which primarily studies systems in thermodynamic equilibrium. Non-equilibrium thermodynamics is often treated as an extension of the classical treatment, but statistical mechanics has brought many advances to that field. The history of thermodynamics as a scientific discipline generally begins with Otto von Guericke who, inbuilt and designed the world's first vacuum pump and demonstrated a vacuum using his Magdeburg hemispheres.

Guericke was driven to make a vacuum in order to disprove Aristotle 's long-held supposition that 'nature abhors a vacuum'. Shortly after Guericke, the Anglo-Irish physicist and chemist Robert Boyle had learned of Guericke's designs and, inin coordination with English scientist Robert Hookebuilt an air pump.

In time, Boyle's Law was formulated, which states that pressure and volume are inversely proportional. Then, inbased on these concepts, an associate of Boyle's named Denis Papin built a steam digesterwhich was a closed vessel with a tightly fitting lid that confined steam until a high pressure was generated.

Later designs implemented a steam release valve that kept the machine from exploding.Note: this document will print in an appropriately modified format 14 pages. It has long been known that some metals are more "active" than others in the sense that a more active metal can "displace" a less active one from a solution of its salt. The classic example is the one we have already mentioned on the preceding page:.

Here zinc is more active because it can displace precipitate copper from solution. If you immerse a piece of metallic zinc in a solution of copper sulfate, the surface of the zinc quickly becomes covered with a black coating of finely-divided copper, and the blue color of the hydrated copper II ion diminishes.

Similar comparisons of other metals made it possible to arrange them in the order of their increasing electron-donating reducing power. This sequence became known as the electromotive or activity series of the metals.

The most active most strongly reducing metals appear on top, and least active metals appear on the bottom. Metals that appear below hydrogen are not strong enough electron donors to reduce hydrogen ions.

These "oxididation" reactions run in the reverse direction notice the left-pointing arrowsso it is now the H 2 that is oxidized.

The activity series has long been used to predict the direction of oxidation-reduction reactions; see here for a nicely-done table with explanatory material. Consider, for example, the oxidation of Cu by metallic zinc that we have mentioned previously.

The fact that zinc is in the upper hald of the activity series means that this metal has a strong tendency to lose electrons. We would therefore expect the reaction.

An old-fashioned way of expressing this is to say that "zinc will displace copper from solution". The above table is of limited practical use because it does not take into account the concentrations of the dissolved species. In order to treat these reactions quantitatively, it is convenient to consider the oxidation and reduction steps separately. The fact that individual half-cell potentials are not directly measurable does not prevent us from defining and working with them.

Although we cannot determine the absolute value of a half-cell potential, we can still measure its value in relation to the potentials of other half cells. In particular, if we adopt a reference half-cell whose potential is arbitrarily defined as zeroand measure the potentials of various other electrode systems against this reference cell, we are in effect measuring the half-cell potentials on a scale that is relative to the potential of the reference cell.

The reference cell that has universally been adopted for this purpose is the hydrogen half-cell that we mentioned previously:.

Thermodynamics

The section labeled "porous barrier" in the diagram prevents the solutions in the two half-cells from mixing, while providing a path for ions having different charges to migrate between cells as required to prevent excess charge to build up in either solution.

Although reduction potentials are defined in reference to the SHE, the hydrogen electrode is difficult to set up and maintain, so it is employed for only the most exacting measurements. Note particularly that: The more negative the half-cell EMF, the greater the tendency of the reductant to donate electrons, and the smaller the tendency of the oxidant to accept electrons. Notice that it also includes some non-metallic oxidant-reductant couples.

A species in the leftmost column can act as an oxidizing agent to any species above it in the reductant column. Oxidants such as Cl 2 that are below H 2 O will tend to decompose water.

Thermodynamic Potentials - University Physics

Oxidation potentials have signs opposite to the reduction potentials we use now, and are commonly encountered in older textbooks and articles. Solution: The above notation represents a cell in which metallic copper undergoes oxidation, delivering electrons to a reactant on the right, which gets reduced.

But what species actually receives the electron?Stanford School of Engineering. New: this online-only course is completely revised and optimized to enhance the learning experience, featuring short videos, animated screencasts, and interactive quizzes. The laws of Thermodynamics and the transition of substance from stable phase at equilibrium are fundamental to the understanding of materials, transfer of energy and work.

The course schedule is displayed for planning purposes — courses can be modified, changed, or cancelled. Course availability will be considered finalized on the first day of open enrollment.

For quarterly enrollment dates, please refer to our graduate education section. Thank you for your interest. The course you have selected is not open for enrollment. Please click the button below to receive an email when the course becomes available again. Request Information. StanfordCalifornia Description New: this online-only course is completely revised and optimized to enhance the learning experience, featuring short videos, animated screencasts, and interactive quizzes.

Topics include Thermodynamic potentials and materials properties Phase equilibria such as unary phase equilibria, solution thermodynamics, phase separation, instability and decomposition Thermodynamics of chemical reactions Thermodynamics of surfaces Chemical reactions Non-stoichiometry in compounds Course Availability The course schedule is displayed for planning purposes — courses can be modified, changed, or cancelled.


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