NotesFAQContact Us
Collection
Advanced
Search Tips
Back to results
Peer reviewed Peer reviewed
Direct linkDirect link
ERIC Number: EJ920476
Record Type: Journal
Publication Date: 2010-Nov
Pages: 5
Abstractor: As Provided
Reference Count: 19
ISBN: N/A
ISSN: ISSN-0021-9584
Rescaling Temperature and Entropy
Olmsted, John, III
Journal of Chemical Education, v87 n11 p1195-1199 Nov 2010
Temperature and entropy traditionally are expressed in units of kelvin and joule/kelvin. These units obscure some important aspects of the natures of these thermodynamic quantities. Defining a rescaled temperature using the Boltzmann constant, T' = k[subscript B]T, expresses temperature in energy units, thereby emphasizing the close relationship between temperature and energy. When temperature is rescaled, entropy must also be rescaled, S' =S/k[subscript B]. Rescaled entropy is dimensionless. Rescaling reveals that the Boltzmann constant (and the gas constant) can be viewed as unit conversion factors between two energy units, kelvin and joule. The machinery of chemical thermodynamics remains intact upon rescaling, inasmuch as "T" and "S" appear together. Similar to entropy, however, heat capacities become dimensionless upon rescaling. Rescaling provides several insights into the nature of thermodynamic quantities: temperature is a measure of energy intensity; entropy is a measure of distribution; heat capacity states the number of modes into which energy is being partitioned. (Contains 3 notes and 1 table.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A