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ERIC Number: EJ829379
Record Type: Journal
Publication Date: 2007-May
Pages: 15
Abstractor: As Provided
Reference Count: 17
ISBN: N/A
ISSN: ISSN-0143-0807
Using Peltier Cells to Study Solid-Liquid-Vapour Transitions and Supercooling
Torzo, Giacomo; Soletta, Isabella; Branca, Mario
European Journal of Physics, v28 n3 pS13-S27 May 2007
We propose an apparatus for teaching experimental thermodynamics in undergraduate introductory courses, using thermoelectric modules and a real-time data acquisition system. The device may be made at low cost, still providing an easy approach to the investigation of liquid-solid and liquid-vapour phase transitions and of metastable states (supercooling). The thermoelectric module (a technological evolution of the thermocouple) is by itself an interesting subject that offers a clear example of both thermo-electric (Seebeck effect) and electro-thermal (Peltier effect) energy transformation. We report here some cooling/heating measurements for several liquids and mixtures, including water, salt/water, ethanol/water and sodium acetate, showing how to evaluate the phenomena of freezing point depression and elevation, and how to evaluate the water latent heat. (Contains 1 footnote, 3 tables, and 10 figures.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail: info@ioppubusa.com; Web site: http://www.iop.org/EJ/journal/EJP
Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A