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Topic: Adiabatic index

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	adiabatic - Search Results - MSN Encarta
		Adiabatic Process, in thermodynamics, any physical process in which quantities such as pressure and volume are varied without any essential transfer...
		Adiabatic may refer to: In thermodynamics, Adiabatic process; Adiabatic index; In quantum mechanics, Adiabatic process; Adiabatic theorem; In electronics.
		Adiabatic Process An adiabatic process is one in which no heat is gained or lost by the system.
	encarta.msn.com /adiabatic.html (149 words)

	Speed of sound - Wikipedia, the free encyclopedia
		κ (kappa) is the adiabatic index (1.402 for air), sometimes noted γ
		κ is the adiabatic index, sometimes called γ.
		where differentiation is taken with respect to adiabatic change.
	en.wikipedia.org /wiki/Velocity_of_sound (833 words)

	Adiabatic Processes
		An adiabatic process is one in which no heat is gained or lost by the system.
		The first law of thermodynamics with Q=0 shows that all the change in internal energy is in the form of work done.
		is a factor in determining the speed of sound in a gas and other adiabatic processes as well as this application to heat engines.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/adiab.html (352 words)

	NOAA - National Weather Service -
		A daily index of geomagnetic activity derived as the average of the eight 3-hourly a indices.
		The rate of decrease of temperature experienced by a parcel of air when it is lifted in the atmosphere under the restriction that it cannot exchange heat with its environment.
		The deviation of a measurable unit (e.g., temperature or precipitation) over a period in a given region from the long-term average, often the thirty-year mean, for that region.
	www.weather.gov /glossary/index.php?letter=a (5004 words)

	United States Patent Application: 0020103269
		[0013] In Equation (1),.lambda.gas is the adiabatic index of the blowing agent existing in the closed cell of rigid polyurethane foam and occupies 74% of the total adiabatic index (.lambda.total).
		.lambda.solid is the adiabatic index of the urethane resin comprising the rigid polyurethane foam and occupies 10% of.lambda.total.
		Generally, the rigid polyurethane foam shows the most excellent heat insulating property when its density is 30-40 kg/m.sup.3..lambda.radiation is the adiabatic index when the radiation is between the closed cells of rigid polyurethane foam and occupies 16% of.lambda.total.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=20020103269.PGNR.&OS=DN/20020103269&RS=DN/20020103269 (2062 words)

	Adiabatic index - Wikipedia, the free encyclopedia
		The adiabatic index of a gas, is the ratio of its specific heat capacity at constant pressure (C
		The piston is now freed and moves outwards, expanding without absorbing energy (adiabatic expansion). Doing this work (proportional to C
		Thus air has an adiabatic index of approximately 1.41; a result often used in aerodynamics.
	en.wikipedia.org /wiki/Adiabatic_index (187 words)

	The Astrophysics Spectator: Polytropic Stars
		There is a tremendous amount of physics buried in the adiabatic index.
		The adiabatic index in a table can be changed by the user by clicking on a cell with the mouse.
		From these solutions, we see that when a star maintains a particular adiabatic index as its core shrinks, the outer surface of the star also shrinks by the same factor.
	www.astrophysicsspectator.com /background/survey/galactic/StarPolytrope.html (1048 words)

	Adiabatic (Gerald L. Hurst)
		I think a concise definition of an adiabatic process is q=0, that >is, there is no net transfer of heat from the system in question and its >environment.
		Radiation losses are generally trivial and the rapid, spherical expansion of the gas cloud at ca 300 M/S or better hardly provides much time for the exchange of heat at the air interface.
		If terms like "adiabatic" and "ideal" offend our academic and puritan sensibilities, we can always resort to the use of suitable limiting adverbs to advise the world that our map is merely a map and not the terrirory.
	yarchive.net /explosives/adiabatic.html (582 words)

	Adiabatic index - Definition, explanation
		The adiabatic index of a gas, is the ratio of its specific heat capacity at constant pressure (C
		The piston is now freed and moves outwards, expanding without absorbing energy (adiabatic expansion).
		Thus air has an adiabatic index of approximately 1.4; a result often used in aerodynamics.
	www.calsky.com /lexikon/en/txt/a/ad/adiabatic_index.php (207 words)

	VAC Manual on Physics Modules
		There are two equation parameters, the adiabatic index eqpar(gamma_) and the adiabatic constant eqpar(adiab_).
		In this case the the second equation parameter is interpreted as the adiabatic coefficient eqpar(adiab_) (adiab_ is an alternative index name instead of csound2_).
		There are two equation parameters: the adiabatic index eqpar(gamma_), and the resistivity eqpar(eta_).
	www.astro.uu.nl /~toth/VACMan/equations.html (1178 words)

	Physics Division \| Hydrodynamics & X-Ray Physics \| Beams & Hydrodynamics \| Los Alamos National Laboratory
		Theoretical results have shown that the stability of propagation in uniform gases depends on the adiabatic index of the gas.
		The experimental verification of the adiabatic index criterion for stability is not yet completed.
		A critical issue for high resolution radiography is the integrity of the bremsstrahlung converter during the electron beam pulse and, for multiple pulse radiography, the spatial extent of the plasma plume for subsequent pulses.
	www.lanl.gov /p/p22/beams.shtml (731 words)

	Ipser, James Reid (1969-04-21) The stability of relativistic, spherically symmetric star clusters. ...
		The stability criteria are used to diagnose numerically the stability of (i) clusters of identical stars with heavily-truncated Maxwell-Boltzmann velocity distributions, and (ii) clusters whose densities and isotropic pressures obey polytropic laws of index 2 or 3.
		The calculations show that a cluster of either type is unstable against collapse if the redshift of a photon emitted from its center and received at infinity is z[subscript c][...] 0.5.
		The first theorem states that a highly relativistic, spherical star is stable if and only if its adiabatic index (assumed to be constant in the interior regions) is greater than a certain critical value, [gamma][subscript crit], which depends in a specified way on the high-density equation of state.
	etd.caltech.edu /etd/available/etd-10152002-160828 (519 words)

	Speed of sound - LearnThis.Info Enclyclopedia (Site not responding. Last check: 2007-10-23)
		where R (287.05 J/kgK for air) is the universal gas constant R divided by the molar mass of air, κ (kappa) is the adiabatic index (1.402 for air), sometimes called γ, and T is the absolute temperature in kelvin.
		This is correct for adiabatic flow; Newton famously used isothermal calculations and omitted the κ from the numerator.
		In an ideal gas the speed of sound is really only dependent on the temperature and not of air pressure.
	encyclopedia.learnthis.info /s/sp/speed_of_sound.html (472 words)

	Rane Professional Audio Reference (Greek)
		Also symbol for adiabatic index of a gas.
		Symbol for refractive index of an optical medium.
		Alternate symbol for adiabatic index of a gas.
	www.rane.com /par-greek.html (600 words)

	Adiabatic index -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-23)
		Adiabatic index -- Facts, Info, and Encyclopedia article
		The piston is now freed and moves outwards, expanding without absorbing energy ((additional info and facts about adiabatic expansion) adiabatic expansion).
		Thus (A mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of) air has an adiabatic index of approximately 1.4; a result often used in (additional info and facts about aerodynamic) aerodynamics.
	www.absoluteastronomy.com /encyclopedia/a/ad/adiabatic_index.htm (208 words)

	Supernova Onset (Site not responding. Last check: 2007-10-23)
		In a hydrodynamic framework it can be understood, why a progenitor star becomes unstable and under which particular conditions the onset of the collapse appears.
		The stability of the core depends on the adiabatic index
		The inner core (Fe or O-Ne-Mg) increases its mass with the ashes from the burning until the Chandrasekhar limit and becomes unstable because of these two fundamental processes.
	www.ps.uci.edu /~silvestri/thesis/THESIS/node14.html (95 words)

	Matter, Energy, and Radiation Hydrodynamics
		Adiabatic compression is compression where the entropy is constant (no heat is added or removed).
		When a gas is adiabatically expanded the speed of sound decreases, when it is adiabatically compressed c_s increases.
		Adiabatic changes move along the isentropic curve, and the energy change is the area below it.
	www.nuclearweaponarchive.org /Nwfaq/Nfaq3.html (20363 words)

	Dr Karl's Q&A forum
		Hi there, the speed of sound in a gas is the square root of the adiabatic index by the gas constant for ait by the temperature in kelvin.
		At sea level at standard atmospheric conditions the difference between the speed of sound at 0% (340 m/s) humidity and 100% (341 m/s) humidity is only about 1 m/s or about 0.3% total change.
		So yes humidity will increase the speed of sound, but only marginally due to the way the water will increase the adiabatic index (heat capacity) of the gas.
	www.abc.net.au /science/k2/stn/q&a/notes/040219-2.htm (619 words)

	Definition of Adiabatic index
		The adiabatic index of a gas, usually denoted by the symbol κ (kappa) (also called γ), is the ratio of its specific heat at constant pressure (c
		To bring the temperature of the gas to its former level one has to heat it a little bit.
		Encyclopedia Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
	www.wordiq.com /definition/Adiabatic_index (226 words)

	2.6 Equations of state
		An analytic equation of state that is commonly used to model relativistic stars is the adiabatic, relativistic polytropic EOS of Tooper [312]:
		coincides with the adiabatic index of a relativistic isentropic fluid
		A study of the relaxation effect in dissipative relativistic fluid theories is presented in [200].
	relativity.livingreviews.org /Articles/lrr-2003-3/node8.html (909 words)

	Jussi Valiviita's subpages (Cosmo-03 talk) (Site not responding. Last check: 2007-10-23)
		Correlated adiabatic and isocurvature CMB fluctuations after the WMAP
		In multi-field inflation models, correlated adiabatic and isocurvature fluctuations are produced and in addition to the usual adiabatic fluctuation with a spectral index n_ad1 there is another adiabatic component with a spectral index n_ad2 generated by entropy perturbation during inflation, if the trajectory in the field space is curved.
		Allowing n_ad1 and n_ad2 to vary independently we find that the WMAP data favour models where the two adiabatic components have opposite spectral tilts.
	www.helsinki.fi /~jvalivii/subpages/cosmo03_talk.html (147 words)

	IAU SYMPOSIUM 218 - Poster Abstracts
		We have seen that the adiabatic index increases by decreasing both entropy and lepton fraction.
		The new observations are combined with previous lower frequencies images of Puppis A, to carry out a detailed study of spatial variations of the spectral index, particularly in the environs of the associated radio-quiet neutron star RX J0822-4300.
		We show that the power law index, the fraction of burst energy in the afterglow, and the return to persistent emission can all be understood if the star is composed of normal barionic material.
	www.atnf.csiro.au /iau-ga/iau218/postabs.html (13204 words)

	Dry Adiabatic Rate
		The dry adiabatic rate is the rate at which dry air changes its temperature as a result of expansion or compression.
		Air rises and cools at the dry adiabatic rate up to the level of condensation where dew point temperature is reached.
		If the air continues to rise it will cool at the saturated adiabatic rate.
	www.uwsp.edu /geo/faculty/ritter/glossary/a_d/dry_adiabatic_rate.html (75 words)

	GR3D Movies (Site not responding. Last check: 2007-10-23)
		adiabatic index is 5/3, and the central density is 5 x 10
		This data is evolved for 240 timesteps, which corresponds to 0.3 milliseconds.
		This data is evolved for 480 timesteps, which corresponds to 0.3 milliseconds.
	wugrav.wustl.edu /research/codes/GR3D/movies.html (313 words)

	Analytic Triple-expansion Modelling (Site not responding. Last check: 2007-10-23)
		In these equations, G is Newton’s gravitational constant, K is the adiabatic constant, n is the polytropic index, P is the pressure, Φ; is the gravitational potential, ρ is the density and r is the radial variable.
		The thermodynamic component is dependent on the adiabatic index Γ which is equal to 1 + 1/n in our work.
		are coefficients dependent on the polytropic index n.
	faculty.vassar.edu /lombardi/student_papers/Adil.shtml (1523 words)

	Hydrodynamic Simulations of Mass Transfer in Algol (Site not responding. Last check: 2007-10-23)
		The simulations explored the dependence of the flow on three parameters; the velocity, angle, and density of the stream of gas flowing from the evolved companion star toward the more massive main sequence star.
		To study the effects of various stream angles and velocities, we ran the simulations with an adiabatic index of 1.01 to simulate strong radiative cooling.
		We then proceeded to investigate the role of radiative cooling by using an adiabatic index of 5/3 and varying the density (and hence cooling rate) in the stream.
	www.aas.org /publications/baas/v25n4/aas183/abs/S8502.html (223 words)

	Binary Neutron Stars (Site not responding. Last check: 2007-10-23)
		The equations of general relativity are solved to determine the equilibrium profiles of identical neutron stars in quasi-stationary circular orbit.
		The stars are each supported by a polytropic equation of state with adiabatic index Gamma = 2.
		The calculated central density of the stars decreases with decreasing binary separation.
	www.physics.uiuc.edu /Research/cta/movies/bns (238 words)

	Detail (Site not responding. Last check: 2007-10-23)
		Compression, expansion, adiabatic, heating, cooling and constant volume processes.
		Specific heats of a perfect gas and the relationships between adiabatic index, specific heats and characteristic gas constant.
		Polytropic, adiabatic and isothermal non-flow processes involving gases and vapours.
	ww2.newi.ac.uk /ects/detail.asp?ID=6 (385 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Energy Citations Database (ECD) Document #5075868 - Observational determination of the adiabatic index in the quiet-time plasma sheet
		Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
		Observational determination of the adiabatic index in the quiet-time plasma sheet
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=5075868 (101 words)

	6.1 Relativistic shock heating in planar, cylindrical and spherical geometry
		Due to conservation of energy across the shock, the gas has a specific internal energy given by
		is the adiabatic index of the equation of state.
		The adiabatic index of the gas is 4/3.
	relativity.livingreviews.org /Articles/lrr-2003-7/articlesu19.html (1248 words)

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