From Free Expansion to Abrupt Compression of an Ideal Gas

Autor/inn/en	Anacleto, Joaquim; Pereira, Mario G.
Titel	From Free Expansion to Abrupt Compression of an Ideal Gas
Quelle	In: European Journal of Physics, 30 (2009) 1, S.177-183 (7 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0143-0807
DOI	10.1088/0143-0807/30/1/018
Schlagwörter	Undergraduate Study; Thermodynamics; Physics; Computation; Simulation; Scientific Concepts; Science Experiments; College Science; Kinetics; Science Instruction + Suchen Sie Ihr Suchwort? Grundstudium; Thermodynamik; Physik; Simulation program; Simulationsprogramm; Kinetik; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht
Abstract	Using macroscopic thermodynamics, the general law for adiabatic processes carried out by an ideal gas was studied. It was shown that the process reversibility is characterized by the adiabatic reversibility coefficient r, in the range 0 [less than or equal] r [less than or equal] 1 for expansions and r [greater than or equal] 1 for compressions. The particular cases of free expansion and reversible adiabatic processes correspond to r = 0 and r = 1, respectively. To conclude the interpretation of r, the relation between r and the variation of the system entropy was also obtained. Comparison between this study and one restricted to expansions following a microscopic point of view showed not only equivalent interpretations but also that our approach is more general, since it also comprises compressions, provides an objective relation between r and entropy change and considers instantaneous varying values of the adiabatic reversibility coefficient. Finally, simulations of selected adiabatic processes are performed and numerical calculations of r are presented. This paper is intended primarily for the undergraduate student, although a comparison with the aforementioned work also requires a background in thermodynamics and kinetic theory. (Contains 1 figure and 1 table.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10