Entropy 2005, 7[1], 68-96
ISSN 1099-4300

The meanings of entropy

Jean-Bernard Brissaud

Lab/UFR High Energy Physics, Physics Department, Faculty of Sciences, Rabat, Morocco.
E-mail: jbbrissaud@softhome.net

Received: 19 November 2004 / Accepted: 14 February 2005 / Published: 14 February 2005

Abstract: Entropy is a basic physical quantity that led to various, and sometimes apparently conflicting interpretations. It has been successively assimilated to different concepts such as disorder and information. In this paper we're going to revisit these conceptions, and establish the three following results:
Entropy measures lack of information; it also measures information. These two conceptions are complementary.
Entropy measures freedom, and this allows a coherent interpretation of entropy formulas and of experimental facts.
To associate entropy and disorder implies defining order as absence of freedom. Disorder or agitation is shown to be more appropriately linked with temperature.

Keywords: entropy; freedom; information; disorder.

MSC 2000 codes: 94A17

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