University Physics with Modern Physics with Mastering Physics (11th Edition)

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PHY133 Gas Thermometry PHY133 - Classical Physics I Laboratory Gas Thermometry The kinetic theory of gases predicts that an ideal gas will obey the relation: pV = nRT, (1) where p is the pressure in pascals (Pa), V is the volume in m 3 , n is the number of moles of the ideal gas, R is the gas constant (8.314 J/mol/K), and T is the temperature in the kelvin scale K. When V and n are kept constant, we see that equation (1) predicts a linear relation between p and T . Using the pressure and temperature characteristics of air, we will estimate the absolute zero of temperature on the Celsius scale. Equipment Hot plate, beaker, aluminum gas cell, large graduated cylinder with reservoir, pressure transducer, power supply, digital voltmeter, ice water. Method The pressure transducer is a very clever device which uses piezoelectric crystals. When squeezed or bent, piezoelectric crystals produce an electric voltage across their two faces (which are covered by a very thin metallic layer to form pick-up electrodes.) By orienting a number of these carefully inside the transducer, one can measure the applied gas pressure from the produced output voltage. In other words, pressure transducer outputs an electric voltage proportional to the applied pressure. The transducers are
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  • Fall '03
  • Rijssenbeek
  • Physics, pressure transducer

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