Using Peltier cell to study solid-liquid-vapour transitions and supercooling
| Autor: | Torzo Giacomo 1, Soletta Isabella 2, Branca Mario 3 |
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| Rok vydání: | 2007 |
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| Zdroj: | European journal of physics 28 (2007): S13–S27. info:cnr-pdr/source/autori:Torzo Giacomo 1, Soletta Isabella 2, Branca Mario 3/titolo:Using Peltier cell to study solid-liquid-vapour transitions and supercooling/doi:/rivista:European journal of physics (Print)/anno:2007/pagina_da:S13/pagina_a:S27/intervallo_pagine:S13–S27/volume:28 |
| Popis: | We propose an apparatus for teaching experimental thermodynamics in undergraduate introductory courses, using thermoelectric modules and 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 |
| Databáze: | OpenAIRE |
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