For other uses of Work in physics Work physics Work electrical Thermodynamics cTopic List of thermodynamic properties System properties In thermodynamics , work performed by a system is the energy transferred ... between work and heat is the crucial essence of thermodynamics . Work refers to forms ... Thermodynamics , Chapter 4 Work and heat , 3rd edition ref , or by thermal radiation ref name Prevost ... in chemical thermodynamics . pV work is represented by the following differential equation ref ... See also Mechanical workThermodynamics Electrical work Chemistry Chemical reactions References reflist ..., Inc., New York ISBN 0 471 82933 1 DEFAULTSORT WorkThermodynamics Category Thermodynamics ar de Volumenarbeit fa simple Workthermodynamics hu Termodinamikai munka .... As such, thermodynamic work is a generalization of the concept of mechanical work in mechanics. Thermodynamic work encompasses mechanical work plus many other types of work, such as electrical ... in thermodynamics. Therefore, all energy changes in a system not a result of heat transfer into or out of the system are thermodynamic work. The external generalized mechanical constraints may be chemical ref name Guggenheim 1985 Guggenheim, E.A. 1985 . Thermodynamics. An Advanced Treatment ..., Bludman, S.A. 2005 . The nonequilibrium thermodynamics of radiation interaction , Chapter 12, pages ... 2009 North, G.R., Erukhimova, T.L. 2009 . Atmospheric Thermodynamics. Elementary Physics ... Essex Kennedy Bludman 2005 , as in radiative transfer. Thermodynamic work is defined to be measurable ... ref name Guggenheim 1985 . In the International System of Units SI system of measurement, work is measured in joule s symbol J . The rate at which work is performed is Power physics power . History 1824 Work, i.e. weight lifted through a height , was originally defined in 1824 by Nicolas L onard ..., according to Carnot We use here motive power work to express the useful effect that a motor is capable ... more details
and Workthermodynamicswork . It defines macroscopic variables such as temperature , entropy , and pressure ... content of thermodynamics is contained in its four laws of thermodynamics laws . The first law specifies that energy can be exchanged between physical systems as heat and Workthermodynamics thermodynamic work . ref cite book author Van Ness, H.C. title Understanding Thermodynamics publisher Dover ... explicitly concerned with the relation between energy exchanges by heat and work. Chemical thermodynamics ... of energy transfers that can be strictly resolved into two distinct components, heat and Workthermodynamicswork , specified by macroscopic variables. ref Bridgman, P.W. 1943 . The Nature of Thermodynamics ... work led Nicolas L onard Sadi Carnot Sadi Carnot , the father of thermodynamics , to publish Reflections ... or not, but which by convention delimits a finite volume. Exchanges of Workthermodynamics ... , the letters labeled according to the stopping points in Carnot cycle . ThermodynamicsThermodynamics ... and by what laws they change with time. Thermodynamics does not describe the microscopic constituents of matter, and its laws can be derived from statistical mechanics . Thermodynamics can ... , chemical reactions , transport phenomena , and even black holes . The results of thermodynamics ..., H.C., Abbott, M.M. title Introduction to Chemical Engineering Thermodynamics publisher McGraw Hill ... Thermodynamics publisher Cambridge University Press year 2001 isbn 0 521 79549 4 oclc 43993556 ref Thermodynamics is one of the best logically structured branches of physics and has become one of the classical ..., on the amount of thermodynamic work that can be delivered to an external system by a thermodynamic ... Taylor and Francis year 1998 isbn 0 7484 0569 0 oclc 36457809 ref Historically, thermodynamics ... s, particularly through the work of French physicist Nicolas L onard Sadi Carnot 1824 who believed that the efficiency ... was the first to formulate a concise definition of thermodynamics in 1854 ref name kelvin1854 cite ... more details
thermodynamics cTopic Branches Equilibrium Thermodynamics is the systematic study of transformations of matter and energy in systems as they approach equilibrium. The word equilibrium implies a state of balance. Equilibrium thermodynamics, in origins, derives from analysis of the Carnot cycle . Here, typically a system, as cylinder of gas, is set out of balance via heat input from a combustion combustion reaction . Then, through a series of steps, as the system settles into its final equilibrium state, work is extracted. In an equilibrium state there are no unbalanced thermodynamic potential potentials , or driving forces, within the system. A central aim in equilibrium thermodynamics is given a system in a well defined initial state thermodynamic state , subject to accurately specified constraints, to calculate what the state of the system will be once it has reached equilibrium. An equilibrium state is obtained by seeking the extrema of a thermodynamic potential function, whose nature depends on the constraints imposed on the system. For example, a chemical reaction at constant temperature ... of their entropy . Equilibrium thermodynamics differs from non equilibrium thermodynamics , in that, with the latter ... by dissipative thermodynamic fluxes. In equilibrium thermodynamics, by contrast, the state of the system ... Ruppeiner geometry is a type of information geometry used to study thermodynamics. It claims ... these equilibrium states is related to the fluctuation between them. See also Non equilibrium thermodynamicsThermodynamics References Adkins, C.J. 1983 . Equilibrium Thermodynamics, 3rd Ed . Cambridge Cambridge University Press. Cengel, Y. & Boles, M. 2002 . Thermodynamics an Engineering Approach, 4th Ed. textbook . New York McGraw Hill. Kondepudi, D. & Prigogine, I. 2004 . Modern Thermodynamics ... . A to Z of Thermodynamics dictionary . New York Oxford University Press. Category Thermodynamics Category Branches of thermodynamics fa ro Echilibru termodinamic ... more details
In the physical sciences, quantum thermodynamics is the study of heat and Workthermodynamicswork dynamics in quantum systems. Approximately, quantum thermodynamics attempts to combine thermodynamics ... can be quantized, as based on the first two laws of thermodynamics as described by Rudolf Clausius ... objective in quantum thermodynamics is the quantitative and qualitative determination of the laws of thermodynamics at the quantum level in which uncertainty and probability begin to take effect. A fundamental question is what remains of thermodynamics if one goes to the extreme limit of small quantum systems having a few degrees of freedom? If thermodynamics applies at this level, does the second law of thermodynamics remain unchanged, or is there a more universal formulation than the many existing ... on. The search for a more universal formulation of the second law of thermodynamics on the quantum level has perplexed physicists for many years. Mechanical quantum and equilibrium thermodynamics ... and dynamics of the two systems mechanical and equilibrium thermodynamics are compared in relation to entropy and the second law of thermodynamics .A more universal description of the laws of thermodynamics is needed to rationalize the two seemingly conflicting notions of mechanical and equilibrium thermodynamics into relative subsets of a completely generalized law. Maxwell explained ... view of thermodynamics and has produced many beneficial results including the Boltzmann equation ... between mechanics and equilibrium thermodynamics. Keenan Thermodynamics The keenan School of thermodynamics ... verses equilibrium thermodynamics problem while still maintaining the formalism implied by the traditional ... and Eilas P. Gyftopoulos have done an extensive amount of work trying to solve this puzzle and, as a result, formulated a resolution of a unified quantum theory of mechanics and thermodynamics ... as both time independent and dependant. vi The entropy of quantum thermodynamics is a measure of the spatial ... more details
Thermodynamics cTopic Thermodynamic system Systems Endoreversible thermodynamics is a subset of irreversible thermodynamics aimed at making more realistic assumptions about heat transfer than are typically made in reversible thermodynamics. It gives an upper bound on the energy that can be derived from a real process that is lower than that predicted by Carnot for a Carnot cycle , and accommodates the exergy destruction occurring as heat is transferred irreversibly. Endoreversible thermodynamics was discovered in simultaneous work by Novikov ref name Novikov1958 I. I. Novikov. The Efficiency of Atomic Power Stations . Journal Nuclear Energy II, 7 125 128, 1958. translated from Atomnaya Energiya, 3 1957 , 409. ref and Chambadal. ref name Chambadal1957 Chambadal P 1957 Les centrales nucl aires . Armand Colin, Paris, France, 4 1 58 ref , although sometimes mistakenly attributed to Curzon & Ahlborn ref name Curzon1975 F.L. Curzon and B. Ahlborn, American Journal of Physics, vol. 43, pp. 22 24 1975 ref Novikov engine Image NovikovEngine.png 500px thumb right Novikov engine showing irreversible heat transfer between T H and T iH, coupled to a Carnot cycle operating between T iH and T C ref name Wagner2008 . An equation for the efficiency of a semi ideal heat engine operating at maximum power output in which heat transfer is irreversible but other components are ideal can be shown to have ... name Callan1985 Callen, Herbert B. 1985 . Thermodynamics and an Introduction to Thermostatistics 2nd ... thermodynamics is given in the thesis by Katharina Wagner ref name Wagner2008 M.Sc. Katharina Wagner, A graphic based interface to Endoreversible Thermodynamics , TU Chemnitz, Fakult t f r Naturwissenschaften ... . It is also introduced by Hoffman et al. ref K. H. Hoffmann. An introduction to endoreversible thermodynamics .... Endoreversible Thermodynamics. J. Non Equilib. Thermodyn., 22 4 311 355, 1997. ref . A thorough discussion ... Thermodynamics Category Thermodynamics ... more details
Biological thermodynamics is a phrase that is sometimes used to refer to bioenergetics , the study of energy transformation in the biological science s. Biological thermodynamics may be defined as the quantitative .... Biological thermodynamics may address the question of whether the benefit associated with any particular ... of the thermodynamics of enzyme catalyzed reactions journal J Biol Chem volume 279 issue 27 pages ... jbc.X400003200 ref was the first major publication on the thermodynamics of biochemical reactions. In addition ... medicine krebss.htm Hans Krebs 1935 ref Non equilibrium thermodynamics has been applied for explaining ... rather than photosynthesis. The focus of thermodynamics in biology The field of biological thermodynamics is focused on principles of chemical thermodynamics in biology and biochemistry . Principles covered include the first law of thermodynamics , the second law of thermodynamics , Gibbs free energy , statistical thermodynamics , reaction kinetics , and on hypotheses of the origin of life. Presently, biological thermodynamics concerns itself with the study of internal biochemical dynamics ... pathways. Thermodynamically, the amount of energy capable of doing work during a chemical reaction ... First Law of Thermodynamics The First Law of Thermodynamics is a statement of the conservation of energy .... ref Haynie, Donald T. Biological Thermodynamics. Cambridge Cambridge UP, 2001. Print. ref From the first ... of Thermodynamics The Second Law of Thermodynamics is primarily concerned with whether or not a given ... by an increase in the entropy of the universe. ref Haynie, Donald T. Biological Thermodynamics ... Thermodynamics textbook . Cambridge Cambridge University Press. Lehninger, A., Nelson, D., & Cox ... Alberty, Robert, A. 2006 . Biochemical Thermodynamics Applications of Mathematica Methods of Biochemical ... Cellular Thermodynamics Wolfe, J. 2002 , Encyclopedia of Life Sciences. http www.bmb.leeds.ac.uk illingworth oxphos physchem.htm Bioenergetics Category Thermodynamics Category Biology Thermodynamics ... more details
steam engine built by Thomas Savery thermodynamics cTopic History and Culture The history of thermodynamics ... of science in general. Owing to the relevance of thermodynamics in much of science and technology ... , internal combustion engine , cryogenics and electricity generation . The development of thermodynamics ... new directions in probability and statistics see, for example, the timeline of thermodynamics . History See also Timeline of thermodynamics Contributions from ancient and medieval times See also History ... between thermodynamics and statistical mechanics. Ancient thinkers such as Leucippus and Democritus ... only known work, a poem conventionally titled On Nature , uses verbal reasoning to postulate ... challenges to caloric theory arose in Benjamin Thompson Rumford s 1798 work, when he showed that boring cast iron cannon s produced great amounts of heat which he ascribed to friction , and his work ... to place the subject of thermodynamics on a solid footing. William Thomson, 1st Baron Kelvin William ... which became known as thermochemistry . Phenomenological thermodynamics File Robert Boyle ... by Joseph Louis Gay Lussac in 1802, but he referenced unpublished work by Jacques Charles from around 1787. The relationship had been anticipated by the work of Guillaume Amontons in 1702. Gay Lussac s law 1802 Birth of thermodynamics as a modern science At its origins, thermodynamics was the study ... Carnot Sadi Carnot , the father of thermodynamics , who in 1824 published Reflections on the Motive Power of Fire , a discourse on heat, power, and engine efficiency. This marks the start of thermodynamics ... slow and clumsy, converting less than 2 of the input fuel into useful work. In other words, large quantities of coal or wood had to be burned to yield only a small fraction of work output. Hence ... left thumb Sadi Carnot 1796 1832 the father of thermodynamics Most cite Nicolas L onard Sadi Carnot ... as the starting point for thermodynamics as a modern science. Carnot defined motive power to be the expression ... more details
Atmospheric thermodynamics is the study of heat to work transformations and the reverse in the earth ... he published voluminous work entitled On the thermodynamics of the atmosphere . ref Zur Thermodynamik ... thermodynamics , atmospheric thermodynamics studies such phenomena as properties of moist air, formation .... Atmospheric thermodynamics forms a basis for cloud microphysics and convection parametrization ..., including convective equilibrium climate models. Overview Atmospheric thermodynamics focuses on water ... dynamics of the atmosphere. The major role of atmospheric thermodynamics is expressed in terms of adiabatic ... Gibbs published Graphical Methods in the Thermodynamics of Fluids. Image Skew T.gif thumb Thermodynamic ... towards the development of theoretical models of atmospheric thermodynamics which drew the attention of the best minds. Papers on atmospheric thermodynamics appeared in the 1860s that treated ... thermodynamics as a branch of science began to take root. The term atmospheric thermodynamics , itself ... the standpoint of atmospheric thermodynamics Occasional scientific papers of the Westwood Astrophysical ... thermodynamics is an integral part of weather forecasting. Chronology 1751 Charles Le Roy recognized ... temperature Chemical thermodynamics Cloud physics Equilibrium thermodynamics Fluid dynamics Non equilibrium thermodynamicsThermodynamics Special topics Lorenz, E. N., 1955, Available potential energy ... author Bohren, C.F., and B. Albrecht title Atmospheric Thermodynamics publisher Oxford University Press year 1998 isbn 0 19 509904 4 Curry, J.A. and P.J. Webster, 1999, Thermodynamics of Atmospheres ... Press . ISBN 0 19 506630 8 thermodynamics of tropical cyclones . Iribarne, J.V. and Godson, W.L., Atmospheric thermodynamics, Dordrecht, Boston, Reidel basic textbook . Petty, G.W., http www.sundogpublishing.com AtmosThermo Announcement.html A First Course in Atmospheric Thermodynamics , Sundog Publishing ..., A. title An Introduction to Atmospheric Thermodynamics publisher Cambridge University Press ... more details
Chemical thermodynamics is the study of the interrelation of heat and thermodynamic workwork with chemical ... of thermodynamics . Chemical thermodynamics involves not only laboratory measurements of various ... questions and the spontaneity of processes. The structure of chemical thermodynamics is based on the first two laws of thermodynamics . Starting from the first and second laws of thermodynamics, four ... simple mathematics. This outlines the mathematical framework of chemical thermodynamics. ref name Book1 cite book last Ott first Bevan J. coauthors Boerio Goates, Juliana title Chemical Thermodynamics ... Image Willard Gibbs.jpg right thumb J. Willard Gibbs founder of chemical thermodynamics In 1865 ... of thermodynamics . ref Clausius, R. 1865 . The Mechanical Theory of Heat with its Applications ... Row. MDCCCLXVII. ref Building on the work of Clausius, between the years 1873 76 the American mathematical ... laws of thermodynamics could be measured graphically and mathematically to determine both the thermodynamic ... processes, and thus established the foundation of the science of chemical thermodynamics. The first was the 1923 textbook Thermodynamics and the Free Energy of Chemical Substances by Gilbert N. Lewis ... Thermodynamics by the methods of Willard Gibbs written by E. A. Guggenheim . In this manner, Lewis, Randall, and Guggenheim are considered as the founders of modern chemical thermodynamics because of the major contribution of these two books in unifying the application of thermodynamics to chemistry . ref name Book1 Overview The primary objective of chemical thermodynamics is the establishment ... Klotz, I. 1950 . Chemical Thermodynamics. New York Prentice Hall, Inc. ref In this manner, chemical thermodynamics is typically used to predict the energy exchanges that occur in the following processes ... concern in chemical thermodynamics Internal energy U Enthalpy H . Entropy S Gibbs free energy G Most identities in chemical thermodynamics arise from application of the first and second laws ... more details
. First law of thermodynamics Heat and work are forms of energy transfer. While conservation of energy energy is invariably conserved , the internal energy of a closed system changes as heat and work ... is zero. Classical thermodynamics describes the exchange of work and heat between systems. It has a special ... the net Workthermodynamicswork done by the system. More specifically, the First Law encompasses the following ...Thermodynamics cTopic Laws of thermodynamics Laws The four laws of thermodynamics define fundamental ... such as perpetual motion . The four laws of thermodynamics are ref name Guggenheim 1985 Guggenheim, E.A. 1985 . Thermodynamics. An Advanced Treatment for Chemists and Physicists , seventh edition, North ... name Adkins 1968 Adkins, C.J. 1968 . Equilibrium Thermodynamics , McGraw Hill, London, ISBN 0 07 084057 1. ref ref name Kondepudi 2008 Kondepudi D. 2008 . Introduction to Modern Thermodynamics , Wiley .... 2008 . Understanding Non equilibrium Thermodynamics. Foundations, Applications, Frontiers , Springer ... PT355 ref Zeroth law of thermodynamics If two systems are in thermal equilibrium with a third system .... Second law of thermodynamics The entropy of any isolated system not in thermal equilibrium ... machine s of the second kind are impossible. Third law of thermodynamics The entropy of a system ... 1962 De Groot, S.R., Mazur, P. 1962 . Non equilibrium Thermodynamics , North Holland, Amsterdam. ref ... of thermodynamics are important fundamental Physical law law s in physics and they are applicable in other natural sciences . Zeroth law The zeroth law of thermodynamics may be stated as follows quote ... equilibrium is fundamental to thermodynamics, the need to state it explicitly as a law ... The first law of thermodynamics may be expressed by several forms of the fundamental thermodynamic relation for a closed system Increase in internal energy of a system heat supplied to the system work ... object. Performing work is a form of energy transfer. For example, when a machine lifts a heavy ... more details
Unreferenced date August 2010 A Chronology timeline of events related to thermodynamics . Before 1800 ... Smeaton publishes a paper on experiment s related to power physics power , mechanical workwork , momentum ... with molecule molecular momentum rather than kinetic energy his work receives little attention other ... law of thermodynamics , and initiating the science of thermodynamics 1827 Robert Brown ... popularises Carnot s work through a graphical and analytic formulation. He also combined Boyle s Law ... training leads to its rejection 1842 Mayer makes a connection between work, heat, and the human ..., and the process reversible process thermodynamics reversed 1843 John James Waterston ... of energy, the first law of thermodynamics 1848 1899 1848 William Thomson, 1st Baron Kelvin William ... Clausius gives the first clear joint statement of the First Law of Thermodynamics first and Second Law of Thermodynamics second law of thermodynamics, abandoning the caloric theory, but preserving Carnot ... s work 1857 Clausius gives a modern and compelling account of the kinetic theory of gases ... space , and publishes his H theorem 1874 Thomson formally states the second law of thermodynamics ... force behind chemical reaction s, and chemical thermodynamics in general. Citation needed .... 1889 Walther Nernst relates the voltage of electrochemical cells to their chemical thermodynamics ... of random molecular motion 1906 Nernst presents a formulation of the third law of thermodynamics ... Constantin Carath odory develops an axiomatic system of thermodynamics 1910 Einstein and Marian ... considers the thermodynamics of atomic spectral line s and predicts stimulated emission 1919 James .... 1957 Edwin T. Jaynes gives Maximum entropy thermodynamics MaxEnt interpretation of thermodynamics ... See also History of physics History of thermodynamics Timeline of information theory List of notable textbooks in statistical mechanics Physics Thermodynamics DEFAULTSORT Timeline Of Thermodynamics ... more details
through an application of workthermodynamicswork , or may be used to produce work. An isochoric process however operates at a constant volume, thus no work can be produced. Many other thermodynamic ... in the form of work is involved. Volume is one of a pair of conjugate variables thermodynamics ...for the general geometric concept volume Thermodynamics cTopic List of thermodynamic properties System properties In thermodynamics , the volume of a thermodynamic system system is an important extensive parameter for describing its thermodynamic state . The specific volume , an intensive property , is the system s volume per unit of mass. Volume is a function of state and is interdependent with other thermodynamic properties such as pressure and thermodynamic temperature temperature . For example ... feet . Heat and work Mechanical work performed on a working fluid causes a change in the mechanical constraints of the system in other words, for work to occur, the volume must be altered. Hence volume .... The product math pV math is the energy lost to a system due to mechanical work. This product ... energy of the system. The second law of thermodynamics describes constraints on the amount of useful work which can be extracted from a thermodynamic system. In thermodynamic systems where the temperature and volume are held constant, the measure of useful work attainable is the Helmholtz free energy and in systems where the volume is not held constant, the measure of useful work attainable is the Gibbs ... energy of the system i.e., there is no pV work, and all the heat affects the temperature ... and the work i.e., the enthalpy thus the temperature changes by a different amount than in the constant ... Yunus A. last2 Boles first2 Michael A. title Thermodynamics an engineering approach year 2002 publisher ... flow rate References reflist DEFAULTSORT Volume Thermodynamics Category Atmospheric thermodynamics Category Gases Category Physical chemistry Category Standards Category Thermodynamics Category Volume ... more details
Refimprove date April 2007 In thermodynamics, a component is a chemically independent constituent of a system. The number of components represents the minimum number of independent species necessary to define the composition of all phases of the system. ref name Atkins Peter Atkins and Julio de Paula, Physical Chemistry 8th Edition W.H. Freeman 2006 , p.175 176 ref Calculating the number of components in a system is necessary, for example, when applying Gibbs phase rule in determination of the number of degrees of freedom physics and chemistry degrees of freedom of a system. The number of components is equal to the number of distinct chemical species constituents , minus the number of chemical reactions between them, minus the number of any constraints like charge neutrality or balance of molar quantities . Examples Water A system that contains water in the liquid state also contains hydronium cations and hydroxyl anions according to the reaction 2 H sub 2 sub O math rightleftharpoons math H sub 3 sub O sup sup OH sup sup The number of components in such a system is 3 chemical constituents 1 chemical reaction 1 constraint charge neutrality 1. CaCO sub 3 sub CaO CO sub 2 sub system This is an example of a system with several phases, which at ordinary temperatures are two solids and a gas. There are three chemical species CaCO sub 3 sub , CaO and CO sub 2 sub and one reaction CaCO sub 3 sub math rightleftharpoons math CaO CO sub 2 sub . The number of components is then 3 1 2 ref name Atkins . If the composition of the same system is instead expressed in terms of ions, the number of independent components does not change. There are now 4 chemical species Ca sup 2 sup , CO sub 3 sub sup 2 sup , O sup 2 sup and CO sub 2 sub and the number of components is calculated as 4 chemical constituents 1 chemical reaction 1 constraint charge neutrality 2. Water Hydrogen Oxygen The reactions .... ref name Atkins References references Category Chemical thermodynamics hu Komponens k mia nl Component ... more details
orphan date August 2010 The thermodynamics of the universe is dictated by which form of energy dominates it relativistic particle s which are referred to as radiation , or non relativistic particles which are referred to as matter. The former are particles whose rest mass is zero or negligible compared to their energy, and therefore move at the speed of light or very close to it the latter are particles whose kinetic energy is much lower than their rest mass and therefore move much slower than the speed of light. The intermediate case is not treated well analytic solution analytically . Energy density in the expanding universe If the universe is not undergoing a phase transition , one can approximate its thermodynamics by neglecting interactions between particles, and assuming all the energy is in the form of heat . Then by the first law of thermodynamics math 0 dQ dU P dV math Where math Q math is the total heat which is assumed to be constant, math U math is the internal energy of the matter and radiation in the universe, math P math is the pressure and math V math the volume. One then finds an equation for the energy density math u equiv U V math , and so math du d left U over V right dU over V U dV over V 2 p u dV over V 3 p u da over a math where in the last equality we used the fact that the total volume of the universe is proportional to math a 3 math , math a math being the Scale factor Universe scale factor of the universe. In fact this equation can be directly obtained from the equations of motion governing the Friedmann Lema tre Robertson Walker metric by dividing the equation above with math dt math and identifying math rho u math the energy density , we get one of the Friedmann Lema tre Robertson Walker metric Interpretation FLRW equations of motions . In the comoving coordinates , math u math is equal to the mass density math rho math . For radiation, math ... Cosmic inflation Thermodynamics First law of thermodynamics Category Physical cosmology ... more details
A diffuser is the mechanical device that is designed to control the characteristics of a fluid at the entrance to a thermodynamic Open system systems theory open system . Diffusers are used to slow the fluid s velocity and to enhance its mixing into the surrounding fluid. In contrast, a nozzle is often intended to increase the discharge velocity and to direct the flow in one particular direction. Frictional effects may sometimes be important, but usually they are neglected. However, the external work transfer is always assumed to be zero. It is also assumed that changes in thermal energy are significantly greater than changes in potential energy and therefore the latter can usually be neglected for the purpose of analysis. HVAC Image Central ventilation tube2.jpg thumb 250px A round diffuser in an HVAC system Diffusers are very common in HVAC heating, ventilating, and air conditioning systems. ref Designer s Guide to Ceiling Based Air Diffusion , ASHRAE, Inc., Atlanta, GA, USA, 2002 ref Diffusers are used on both all air and air water HVAC systems, as part of room air distribution subsystems, and serve several purposes To deliver both conditioning and ventilating air Evenly distribute the flow of air, in the desired directions To enhance mixing of room air into the primary air being discharged Often to cause the air jet s to attach to a ceiling or other surface, taking advantage of the Coanda effect Coand effect To create low velocity air movement in the occupied portion of room Accomplish the above while producing the minimum amount of noise When possible, dampers, extractors, and other flow control devices should not be placed near diffusers inlets necks , either not being used at all or being placed far upstream. They have been shown to dramatically increase noise production. For as cataloged diffuser performance, a straight section of duct needs serve a diffuser. An elbow, or kinked flex duct, just before a diffuser often leads to poor air distribution and incr ... more details
pp move indef wiktionary workWork may refer to tocright Human labor Employment , a contract between two parties, one being the employer and the other being the employee. House work , cleaning the rooms and furnishings of a home Labor economics , measure of the work done by human beings Manual labour , physical work done by people Wage labour , in which a worker sells their labor and an employer buys it Work project management , the effort applied to produce a deliverable or accomplish a task Working ... Physics Work physics , the amount of work done by, or energy transferred by, a force acting through a distance Work electrical , the work done by, or energy transferred by, a force from an electric field acting on a charge though a distance Workthermodynamics , the quantity of total energy transferred from one system to another, not counting energy transferred by heat Mechanical work, a subset of work physics with the connotation that the force doing work is a mechanical, pressure, or contact ..., in Indian religions Good works Work Christian theology , acts of charity Law Work, the subject matter of copyright law Film Media Work 1915 film Work 1915 film , a 1915 silent film co starring Edna Purviance WORK FM , an American FM radio station licensed to serve Barre, Vermont Work professional wrestling , a staged event Work painting Work painting , by Ford Madox Brown Work A Story of Experience , a 1873 novel by Louisa May Alcott Work , a 1978 play by Ron Milner Music The Work band , band Work Records aka WORK or The WORK Group , a music label under Sony Records iyot , a release by the electronic music duo Orbital Work Ciara song Work Ciara song , a 2009 single by Ciara Work Jars of Clay song Work Jars of Clay song , a 2006 song by Jars of Clay Work Jimmy Eat World song Work Jimmy Eat World song , a 2004 song by the rock band Jimmy Eat World Work , a song by Bob Marley from his album Uprising Bob Marley & The Wailers album Uprising Work Kelly Rowland song Work Kelly Rowland ... more details
Work It may refer to Work It TV series Work It TV series , a 2012 American sitcom Work It Missy Elliott song Work It Missy Elliott song Work It Nelly song Work It Nelly song Work It , a song by Monrose from Temptation Monrose album Track listing Temptation disambiguation it Work It ... more details
The Work is a term that is used to refer to amongst others The Work, pt. 1 , a 2001 song by Prince The Magnum opus alchemy Great Work or magnum opus of Hermeticism and Alchemy The Fourth Way teaching of G. I. Gurdjieff The teachings of Byron Katie referred to as The Work The Work band , an English experimental rock band Opus Dei a Catholic religious organization which literally means God s Work disambig de The Work ... more details
Unreferenced stub auto yes date December 2009 A work in is a form of direct action , where a group of workers whose jobs are under threat resolve to remain in their place of employment and continue producing without pay. The intention is usually to show that their place of work still has long term viability, or can be effectively Workers self management self managed by the workers . History Historical examples of the work in include The Upper Clyde Shipbuilders work in of 1971. The 1971 Harco work in Harco Steel work in of 1971. See also Die in Sit in Teach in Strike action DEFAULTSORT Work In Category Employment Category Labor Category Labour relations Job stub Labor dispute stub fr Work in ... more details
for the song by Mary J. Blige Work That Refimprove date March 2012 Infobox single See Wikipedia WikiProject Songs Name Work That Cover Work That .jpg Artist Teriyaki Boyz featuring Pharrell and Chris Brown American singer Chris Brown Album Serious Japanese A side B side Released January 14, 2009 Format CD single , Music download Digital download Recorded 2008 Genre Japanese hip hop J hip hop Length 4 59 Label Star Trak Entertainment Writer Producer Pharrell Audio sample? Certification Chronology Teriyaki Boyz singles Last single Zock On br 2008 This single Work That br 2009 Next single Misc Extra chronology Artist Pharrell singles Type singles Last single I Apologize br 2009 This single Work That br 2009 Next single Blanco song Blanco br 2009 Extra chronology Artist Chris Brown American singer Chris Brown singles Type singles Last single Freeze T Pain song Freeze br 2008 This single Work That br 2009 Next single Better on the Other Side br 2009 Work That is the third single from Japanese hip hop group Teriyaki Boyz s studio album Serious Japanese . The song features Pharrell and Chris Brown American singer Chris Brown . Charts Work That peaked at number 7 on the Japan Hot 100 Singles chart on the chart week of January 27, 2009. class wikitable align left Chart 2008 style text align center Peak br position align left Japan Hot 100 Singles style text align center 7 ref http www.billboard.com bbcom esearch chart display.jsp?cfi 848&cfgn Singles&cfn Japan Hot 100 Singles&ci 3105752&cdi 10119015&cid 01 2F23 2F2009 dead link date March 2012 ref References Reflist Pharrell Williams Chris Brown singles Teriyaki Boyz Category 2009 singles Category Pharrell Williams songs Category Chris Brown American singer songs 2000s hiphop single stub ... more details
Unreferenced date May 2008 for the song by Teriyaki Boyz Work That Infobox Single Name Work That Cover Maryjworkthat.jpg Artist Mary J. Blige featuring Busta Rhymes from Album Growing Pains album Growing Pains Released December 18, 2007 Format Music download Digital download Recorded 2007 Genre Hip hop soul Length 3 27 Label Geffen Records Writer Neff U, Mary J. Blige , Sean Garrett small Producer Neff U Chronology Last single Just Fine br 2007 This single Work That br 2007 Next single Hurt Again br 2008 Work That was released as the second single by Mary J. Blige from her eighth album Growing Pains album Growing Pains . Work That was featured in an iTunes commercial and was released on iTunes the day after Thanksgiving in 2007. The song has been serviced to Urban contemporary Urban radio stations. A remix featuring Busta Rhymes has been released to radio. No video was filmed for the single. When it was available as a digital download, the single was still not officially released, but did eventually reach 65 on the Billboard Hot 100 . Charts class wikitable Chart 2007 2008 Peak br position U.S. Hot R&B Hip Hop Songs align center 16 U.S. Billboard Hot 100 align center 65 U.S. Billboard Pop 100 align center 53 References reflist Mary J. Blige Category 2008 singles Category Mary J. Blige songs Category Songs written by Sean Garrett Category Songs written by Mary J. Blige Category Songs produced by Theron Feemster ... more details
Thermodynamics cTopic Laws of thermodynamics Laws The zeroth Laws of thermodynamics law of thermodynamics .... If A , B , and C are distinct thermodynamic system s, the zeroth law of thermodynamics can be expressed ... of Classical Thermodynamics year 1966 publisher Cambridge University Press page 73 ref blockquote ... D. Kondepudi title Introduction to Modern Thermodynamics year 2008 publisher Wiley page 7 url http www.amazon.com Introduction Modern Thermodynamics Dilip Kondepudi ref blockquote If A is in thermal ... scale s, and justifies the use of the second law of thermodynamics to provide an absolute, or thermodynamic ... Newton . Nicolas L onard Sadi Carnot Carnot took it as a presupposition for his work. Thermometers ... 1980 Truesdell, C.A. 1980 . The Tragicomical History of Thermodynamics, 1822 1854 , Springer, New York ... , pages 3 32, especially page 6, in New Perspectives in Thermodynamics , edited by J. Serrin, Springer ... have equal temperatures. ref Beattie, J.A., Oppenheim, I. 1979 . Principles of Thermodynamics , Elsevier ... of the zeroth law of thermodynamics, Am. J. Phys. 30 294 296. ref Clifford Truesdell Truesdell ... to the other. ref Truesdell, C.A. 1980 . The Tragicomical History of Thermodynamics, 1822 1854 , Springer ... is to diminish the entropy of the system, or the energy, available as work, which can be obtained from ... on Thermodynamics , translated by A. Ogg, Longmans, Green, London, page 2. ref Planck repeated ... of thermodynamics began to appear in textbooks to refer to statements of this kind, though now stripped ... example is in the textbook of statistical thermodynamics of Fowler and Guggenheim 1939 1965 . ref Fowler, R., Guggenheim, E.A. 1939 1965 . Statistical Thermodynamics. A version of Statistical Mechanics ... of the thermodynamics states of the assemblies, which may be called the temperature t , any one of the assemblies ... of the Existence of temperature could with advantage be known as the zeroth law of thermodynamics ... formulation of homogeneous system macroscopic thermodynamics is undoubtedly that of Carath odory page ... more details
of heat supplied to the system, minus the amount of Workthermodynamicswork performed ... to a combination of heat added to the system and Workthermodynamicswork done by the system. Taking ...Thermodynamics cTopic Laws of thermodynamics Laws The first law of thermodynamics is a version of the law ... system is constant. Original statements The first explicit statement of the first law of thermodynamics ... work is produced by the agency of heat, a quantity of heat is consumed which is proportional to the work done and conversely, by the expenditure of an equal quantity of work an equal quantity ... , translation here taken from Truesdell, C.A. 1980 . The Tragicomical History of Thermodynamics ... of heat accumulated by the system and the increment of work done by it. ref Clausius, R. 1850 ... gallica.bnf.fr ark 12148 bpt6k15164w f400.image . ref Description The first law of thermodynamics was expressed ... leave the system in its original state. In each repetition of a cyclic process, the work done by the system ... does work on its surroundings, it is necessary that some heat be taken in by the system and some ... to the system and work done by the system, respectively. Note that the minus sign in front of math delta W math indicates that a positive amount of work done by the system leads to energy being lost from the system. An alternate convention is to consider the work performed on the system by its surroundings. This leads to a change in sign of the work. This is the convention adopted by many modern ... on physics define work as work done by the system. When a system expands in a quasistatic process , the work done on the environment is the product of pressure P and volume V change, i.e. gaps P d V , whereas the work done on the system is gaps P d V . The change in internal energy of the system is math dU delta Q PdV. , math Work and heat are expressions of actual physical processes which add ... as the result of heating, rather than referring to a particular form of energy. Likewise, work energy ... more details
Thermodynamics Foundations, Applications, Frontiers , Springer Verlag, Berlin, e ISBN 9783540742524. ref Overview Non equilibrium thermodynamics is a work in progress, not an established edifice ...thermodynamics cTopic Branches Non equilibrium thermodynamics is a branch of thermodynamics that deals ... reactions. Non equilibrium thermodynamics is concerned with transport processes and with the rates of chemical reactions. ref Fowler, R., Guggenheim, E.A. 1939 . Statistical Thermodynamics , Cambridge ... systems requires more general concepts than are dealt with by equilibrium thermodynamics . One fundamental difference between equilibrium thermodynamics and non equilibrium thermodynamics lies ... which are not considered in equilibrium thermodynamics of homogeneous systems. This is discussed ... thermodynamics include time rate of dissipation of energy Rayleigh 1873, ref name Rayleigh 1873 Cite ..., I. 1970 . Non equilibrium Thermodynamics. Field Theory and Variational Principles , translated by E. Gyarmati and W.F. Heinz, Springer, Berlin. ref ref name Lavenda 1978 Lavenda, B.H. 1978 . Thermodynamics ... 1970 Non equilibrium Thermodynamics. Field Theory and Variational Principles , translated by E. Gyarmati ... variant system time variation . One initial approach to non equilibrium thermodynamics might be called quasi zero dimensional . There are other approaches to non equilibrium thermodynamics, for example extended irreversible thermodynamics , ref name Lebon Jou Casas V zquez 2008 ref name JCVL 1993 but they are hardly touched on in the present article. Quasi radiationless non equilibrium thermodynamics ... Wildt first R. year 1972 title Thermodynamics of the gray atmosphere. IV. Entropy transfer and production ... journal last Essex first C. year 1984a title Radiation and the irreversible thermodynamics of climate ... of bilinearity in the irreversible thermodynamics of irreversible processes journal Planetary ... thermodynamics ignore radiant heat they can do so because they refer to laboratory quantities of matter ... more details
In thermodynamics , a critical line is the higher dimensional equivalent of a Critical point thermodynamics critical point ref B. Windom, Theory of Phase Equilibrium , J. Phys. Chem 1996 , 13190 13199 ref . It is the locus of contiguous critical points in a phase diagram . These lines cannot occur for a single substance due to the Gibbs phase rule phase rule , but they can be observed in systems with more variables, such as mixtures. Two critical lines may meet and terminate in a tricritical point . References references States of matter Category Thermodynamics Category Critical phenomena ... more details
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