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Topic: System (thermodynamics)

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	Entropy: Primer and Historical Notes
		Thermodynamics is the branch of the physical sciences that studies the transfer of heat and the interconversion of heat and work in various physical and chemical processes.
		In thermodynamic terms, a system is defined as a part of the total universe that is isolated from the rest of the universe by definite boundaries, such as the coffee in a covered Styrofoam cup; a closed room; a cylinder in an engine; or the human body.
		The second law of thermodynamics on the atomic and molecular level is a statistical law; it expresses a tendency toward randomness and disorder in a system having a large number of particles.
	www.ldolphin.org /entropynotes.html (4751 words)

	Thermodynamics of Living Systems
		It is widely held that in the physical sciences the laws of thermodynamics have had a unifying effect similar to that of the theory of evolution in the biological sciences.
		The entropy of a system is a measure of the probability of a given arrangement of mass and energy within it.
		The formation and maintenance of living systems at energy levels well removed from equilibrium requires continuous work to be done on the system, even as maintenance of hot water in a water heater requires that continuous work be done on the system.
	www.ldolphin.org /mystery/chapt7.html (3964 words)

	PowerPedia:Thermodynamics - PESWiki (Site not responding. Last check: 2007-10-10)
		Thermodynamics (from the Greek thermos meaning heat and dynamis meaning power) is a branch of physics that studies the effects of changes in temperature, pressure, and volume on physical systems at the macroscopic scale by analyzing the collective motion of their particles using statistics.
		Classical thermodynamics is the original early 1800s variation of thermodynamics concerned with thermodynamic states, and properties as energy, work, and heat, and with the laws of thermodynamics, all lacking an atomic interpretation.
		When a system is at equilibrium under a given set of conditions, the thermodynamic state is said to be in a "definite state".
	peswiki.com /index.php/PowerPedia:Thermodynamics (4312 words)

	Thermodynamics - Wikipedia, the free encyclopedia
		Central to this are the concepts of system and surroundings.
		A system is the region of the universe under study.
		The change in the internal energy of a closed thermodynamic system is equal to the sum of the amount of heat energy supplied to the system and the work done on the system.
	en.wikipedia.org /wiki/Thermodynamics (2458 words)

	Second Law of Thermodynamics (Site not responding. Last check: 2007-10-10)
		Thermodynamics deals only with the large scale response of a system which we can observe and measure in experiments.
		In aerodynamics, the thermodynamics of a gas obviously plays an important role in the analysis of propulsion systems but also in the understanding of high speed flows.
		The first law of thermodynamics defines the relationship between the various forms of energy present in a system (kinetic and potential), the work which the system performs and the transfer of heat.
	www.grc.nasa.gov /WWW/K-12/airplane/thermo2.html (574 words)

	Enthalpy (Site not responding. Last check: 2007-10-10)
		Thermodynamics is a branch of physics which deals with the energy and work of a system.
		From our study of the first law of thermodynamics, we have found that the internal energy of a gas is also a state variable, that is, a variable which depends only on the state of the gas and not on any process that produced that state.
		Let's consider the first law of thermodynamics applied to a gas system with both heat transfer (Q) and work (W) done by the system in going from state 1 to state 2.
	wright.nasa.gov /airplane/enthalpy.html (605 words)

	Sample Chapter for Haddad, W.M., Chellaboina, V., Nersesov, S.G.: Thermodynamics: A Dynamical Systems Approach.
		While energy describes the state of a dynamical system, entropy refers to changes in the status quo of the system and is a measure of molecular disorder and the amount of wasted energy in a dynamical (energy) transformation from one state (form) to another.
		Thermodynamics based on statistical mechanics is known as statistical thermodynamics and involves the mechanics of an ensemble of many particles (atoms or molecules) wherein the detailed description of the system state loses importance and only average properties of large numbers of particles are considered.
		Specifically, using the system ectropy as a Lyapunov function candidate, we show that in the absence of energy exchange with the environment, the proposed thermodynamic model is semistable with a uniform energy distribution corresponding to a state of minimum ectropy and a state of maximum entropy.
	www.pupress.princeton.edu /chapters/s8122.html (5157 words)

	System (thermodynamics) - Wikipedia, the free encyclopedia
		In thermodynamics, a thermodynamic system is defined as that part of the universe that is under consideration.
		A real or imaginary boundary separates the system from the rest of the universe, which is referred to as the environment or surroundings (sometimes called a reservoir.) A useful classification of thermodynamic systems is based on the nature of the boundary and the quantities flowing through it, such as matter, energy, work, heat, and entropy.
		Thermodynamics is basically concerned with the flow and balance of energy and matter in a thermodynamic system.
	en.wikipedia.org /wiki/System_(thermodynamics) (1301 words)

	Thermodynamics
		Conversely when w is negative work has been done on the system by the surrounding and when positive, work has been done by the system on the surroundings.
		This demonstrates that some of the heat of the surroundings has to be absorbed by the system in order to perform the work of changing the system volume.
		Thermodynamic calculations do not give information as to the rates of reaction only whether they are favorable or not.
	web.indstate.edu /thcme/mwking/thermodynamics.html (1538 words)

	First Law of Thermodynamics (Site not responding. Last check: 2007-10-10)
		We will present some simple examples of these laws and properties for a variety of physical systems, although we are most interested in the thermodynamics of propulsion systems and high speed flows.
		If a system is fully insulated from the outside environment, it is possible to have a change of state in which no heat is transferred into the system.
		The implementation of the first law of thermodynamics for gases introduces another useful state variable called the enthalpy which is described on a separate page.
	www.grc.nasa.gov /WWW/K-12/airplane/thermo1.html (569 words)

	First Law of Thermodynamics
		The first law of thermodynamics is the application of the conservation of energy principle to heat and thermodynamic processes:
		Four quantities called "thermodynamic potentials" are useful in the chemical thermodynamics of reactions and non-cyclic processes.
		When work is done by a thermodynamic system, it is ususlly a gas that is doing the work.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/firlaw.html (515 words)

	Perpetual Motion (solitaire) Summary
		Systems that are unchanging for practical purposes, but which are running down ever so slowly, do not count as perpetual motion.
		One statement of the second law of thermodynamics is that there is a tendency in nature for an isolated system (no external inputs) to move toward conditions that are statistically more probable (higher entropy).
		Thermodynamics does not predict that all the energy can never return to the swinging mode; it just states that in the foreseeable duration of the universe it is not likely to happen because there are so many other possibilities.
	www.bookrags.com /Perpetual_Motion_(solitaire) (2239 words)

	Specific Heats (Site not responding. Last check: 2007-10-10)
		If we are dealing with a gas, it is most convenient to use forms of the thermodynamics equations based on the enthalpy of the gas.
		This rather remarkable result has been derived from thermodynamic relations, which are based on observations of physical systems and processes.
		In the kinetic theory of gases, this result is derived from considerations of the conservation of energy at a molecular level.
	wright.nasa.gov /airplane/specheat.html (881 words)

	Thermodynamics
		Granted, thermodynamics is a pretty broad subject area as you already know from your introductory thermodynamics courses.
		As we progress to multi-component systems, it will be useful to discuss binary- and ternary systems in the context of specific materials.
		Keep in mind that the free energy condition is a thermodynamic one only; it does not describe the rate at which transformations from one phase to another may take place, even if they are thermodynamically favorable.
	www.tulane.edu /~bmitche/book/thermo.html (1365 words)

	[No title]
		] Any of the quantities defining the thermodynamic state of a substance in thermodynamic equilibrium; for a perfect gas, the pressure, temperature, and density are the fundamental thermodynamic variables, any two of which are, by the equation of state, sufficient to specify the state.
		] One of several extensive quantities which are determined by the instantaneous state of a thermodynamic system, independent of its previous history, and which are at a minimum when the system is in thermodynamic equilibrium under specified conditions.
		] A quantity which is either an attribute of an entire system or is a function of position which is continuous and does not vary rapidly over microscopic distances, except possibly for abrupt changes at boundaries between phases of the system; examples are temperature, pressure, volume, concentration, surface tension, and viscosity.
	www.accessscience.com /Dictionary/T/T12/DictT12.html (1465 words)

	Entropy
		Entropy is a measure of a system's disorder.
		Today, thermodynamics recognizes three types of systems: (1) isolated, which do not share matter or energy with their environments, (2) closed, which share energy and/or information but not matter, and (3) open, which share matter and energy and/or information.
		If we think of complex systems as being composed of millions of tiny subsystems (for example, the cells in our body, the citizens of a country, or the molecules in an object) then we will discover that each subsystem can act randomly while the overall system itself is in equilibrium and is relatively predictable.
	www.schuelers.com /ChaosPsyche/part_1_9.htm (1556 words)

	Process Simulation
		The SYSTEM 7 Process Explorer® patented interface allows navigation between various systems, analyses, and thermophysical property databases using a convenient tree-view style design.
		SYSTEM 7 is the next generation simulation tool you have been waiting for - opening up process simulation to chemical engineers without requiring a detailed knowledge of thermodynamics - an industry first!
		SYSTEM 7 Process Explorer streamlines your process engineering work utilizing the highest quality physical property data, field proven computational engines and an intuitive interface designed to save you time and realize your company's production, safety, and environmental goals.
	www.epcon.com /product121.htm (322 words)

	The logic conflict of the second law of thermodynamics
		From the second law of thermodynamics, the system should have a stable balanced state.
		Whether the system has stable state or not, should be determined by physical equations which should includes heat and electricity.
		"When certain amount of heat is provided to the system, a part of it use to increase the internal energy and rest in doing work" and ofcourse at the end of it all the system becomes stable as you have put it.
	www.physicsforums.com /showthread.php?t=77032 (1296 words)

	Rejection of Pascal's Wager: Second Law of Thermodynamics (Site not responding. Last check: 2007-10-10)
		This quantity, for a system, is derived from the ratio of the heat energy of a system to the highest temperature object within the system.
		A closed system is a system in which there is not energy exchange between itself and the environment surrounding it.
		Note the second law is not applicable to an open system; where energy exchange between the system and the surroundings occurs.
	www.geocities.com /paulntobin/secondlaw.html (1679 words)

	Open Directory - Science: Physics: Thermodynamics (Site not responding. Last check: 2007-10-10)
		A Concise History of Thermodynamics - An overview of the history/evolution of thermodynamics.
		The Expert System For Thermodynamics - TEST is a visual environment to solve thermodynamics problems, pursue what-if scenarios and perform numerical experiments.
		The Second Law of Thermodynamics - A qualitative introduction to the second law and entropy written for beginners in chemistry but useful for physics students too.
	dmoz.org /Science/Physics/Thermodynamics (403 words)

	Phase Diagrams & Computational Thermodynamics
		A phase diagram is the representation of phase equilibria present in a system as function of the controlling variables, typically composition and temperature.
		Computational Thermodynamics is the discipline by which phase diagrams are generated by analysis of the basic thermodynamic properties of the system.
		Computational thermodynamics enables us to predict some features of the system which are not easily measured, as well as to predict phase diagrams of complex multicomponent systems.
	www.metallurgy.nist.gov /phase (255 words)

	Overview - TEST Tutorial
		As more specificity is added to the system (steady vs. unsteady, for instance), the changes in the system (shown by an animation) and governing equations (mass, energy, and entropy balance equations) are displayed.
		When you evaluate a property using a state daemon, the entire state, consisting of material, thermodynamic, extrinsic, and even some system properties, are evaluated at once.
		TEST daemons can be used as numerical laboratories to explain the behavior of thermodynamic properties such as entropy and internal energy that are hard to quantify when introduced purely from a theoretical standpoint.
	www.usc.edu /mirrors/testcenter/testhome/Test/intro/welcome.html (2901 words)

	Thermodynamics of Small Systems (Site not responding. Last check: 2007-10-10)
		This hardcover edition is a summary of the basics of small system (or nonmacroscopic) thermodynamics, written by the originator of the field.
		Originally published in two volumes it remains essential reading in a field whose practical aim is to derive equations that provide interconnections among various thermodynamic functions.
		Part I introduces the basics of small system thermodynamics, exploring environmental variables, noting throughout the ways in which small thermodynamic systems differ operationally from macroscopic systems.
	store.doverpublications.com /0486495094.html (377 words)

	Bundles: ScienceWorkshop General (Site not responding. Last check: 2007-10-10)
		The Comprehensive Physics Starter System addresses the mechanics portion of the physics curriculum and represents the entry point for the Comprehensive Physics System.
		This Mechanics System combines a dynamics system and probeware for performing a wide variety of mechanics experiments.
		Combines a dynamics system and powerful 750 interface (USB) for conducting fundamental and advanced mechanics experiments.
	www.pasco.com /products/groups/31-395-1.html (172 words)

	Building Loads Analysis and System Thermodynamics (BLAST) (Site not responding. Last check: 2007-10-10)
		Due to the complexity of building interactions, a computerized means for predicting energy consumption and system performance is necessary.
		User inputs include building construction and operating costs (excluding energy), fan system construction and maintenance costs, and user-supplied and default capital and maintenance costs for plant components.
		The documentation for the BLAST system, as well as the program, is available from the BLAST Support Office, COMM 217-333-3977; or University of Illinois, 144 Mechanical Engineering Building, 1206 West Green Street, Urbana, IL 61801.
	www.cecer.army.mil /facts/sheets/PL30.html (496 words)

	WBDG: BLAST (Building Loads Analysis and System Thermodynamics)
		The BLAST (Building Loads Analysis and System Thermodynamics) system is a set of computer programs for predicting heating and cooling energy consumption in buildings, and analyzing energy costs.
		BLAST can be used to investigate the energy performance of new or retrofit building design options of almost any type and size.
		In addition to performing peak load (design day) calculations necessary for mechanical equipment design, BLAST also estimates the annual energy performance of the facility, which is essential for the design of solar and total energy (cogeneration) systems and for determining compliance with design energy budgets.
	www.wbdg.org /tools/blast.php (145 words)

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