W 18E “Heat Capacity Ratio Γ ”
Fakultät für Physik und Geowissenschaften Physikalisches Grundpraktikum W 18e “Heat Capacity Ratio γ ” Tasks 1 Determine the heat capacity ratio γ of air and carbon dioxide using the method of Clément and De- sormes. 2 Determine the sound velocity in air and calculate the heat capacity ratio γ. Calculate the molar heat capacities at constant pressure and constant volume for air, respectively. 3 Determine the heat capacity ratio γ for air and carbon dioxide using the resonance-tube method. Additional task: Determine the heat capacity ratio γ of a gas using the method by Flammersfeld. Literature Physikalisches Praktikum, 13. Auflage, Hrsg. W. Schenk, F. Kremer, Wärmelehre, 2.0.1, 2.0.2, 2.2 Physics, P. A. Tipler, 3rd Edition, Vol. 1, 14-1, 16-4, 16-5, 16-6, 16-7, 16-8 University Physics, H. Benson, Chap. 20 Accessories Pressure gas cylinder with CO2, air pump, digital manometer, glass bottle, function generator, electro- acoustic transducer, amplifier, oscilloscope, resonance equipment Keywords for preparation - Adiabatic and isothermal transformations of state, 1st Law of Thermodynamics - Heat capacities cp and cv of gases - Definition of the adiabatic exponent γ, dependence on the atomic structure of an ideal gas - Determination of γ after Clément and Desormes - Sound propagation in gases, compressibility, bulk modulus - Generation of Lissajous figures - Determination of γ by the resonance tube method Remarks In order to increase accuracy measurements should be repeated. Compare the measurement uncer- tainties of the different techniques. Further compare the experimental values of the adiabatic expo- nent γ with theoretical values calculated for the various molecules.
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