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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > March  >
In the Laboratory
Cp/Cv Ratios Measured by the Sound Velocity Method Using Calculator-Based Laboratory Technology
Mario Branca
Dipartimento di Chimica, Università di Sassari, 07100, Sassari, Italy

Isabella Soletta
Istituto di Istruzione Superiore “G. Manno”, 07041 Alghero (Sassari), Italy
Cover
March 2007
Vol. 84 No. 3
p. 462
Abstract

The velocity of sound in a gas depends on its temperature, molar mass, and λ = Cp / Cv, ratio (heat capacity at a constant pressure to heat capacity at constant volume). The λ values for air, oxygen, nitrogen, argon, and carbon dioxide were determined by measuring the velocity of the sound through the gases at room temperature. The sound velocity is measured with a microphone using Calculator-Based Laboratory (CBL) Technology.

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Detailed procedure instructions for the setup and use of the CBL and calculator are available.
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Citation
Branca, Mario; Soletta, Isabella. J. Chem. Educ. 2007 84 462.
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Keywords
First-Year Undergraduate / General; Gases; Hands-On Learning / Manipulatives; Laboratory Instruction; Physical Chemistry; Physical Properties; Second-Year Undergraduate; Thermodynamics
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History
Created:
Last Updated:
2/1/2007
2/16/2007
 Caution! 
Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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