Entropy and the second law: A pedagogical alternative
作者:
Ralph Baierlein,
期刊:
American Journal of Physics
(AIP Available online 1994)
卷期:
Volume 62,
issue 1
页码: 15-26
ISSN:0002-9505
年代: 1994
DOI:10.1119/1.17732
出版商: American Association of Physics Teachers
关键词: ENTROPY;THERMODYNAMICS;MULTIPLICITY;CARNOT CYCLE;EDUCATIONAL TOOLS;THERMAL EFFICIENCY
数据来源: AIP
摘要:
Thermodynamics in introductory physics typically begins with the ideas of temperature and heating and with the first law of thermodynamics. Then the more difficult parts come: entropy and the second law of thermodynamics. This second portion of the course can begin with a microscopic conception of entropy and a qualitative idea of how thermal systems evolve. The key concept is the ‘‘multiplicity of a macrostate:’’ the number of microstates associated with a macrostate. Starting from these notions—a point of departure and a concept—this paper develops the second law of thermodynamics, the relationship ΔS≥(energy input by heating)/T, and the Carnot efficiency. Offer the entire development both as a specific alternative to what appears in typical introductory texts and as a contribution to a continuing discussion of how to teach thermodynamics to various college audiences.
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