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PHY133_Absolute_Zero - PHYSICS 133 EXPERIMENT NO 9 GAS...

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PHYSICS 133 EXPERIMENT NO. 9 GAS THERMOMETRY, OR THE QUEST FOR THE ABSOLUTE ZERO Introduction The kinetic theory of gases states that an ideal gas will obey the relation pV = nRT (1) where, in SI units, p is the pressure in Pascals, V is the volume in m 3 , n is the number of moles of gas, R is the gas constant (8.31 J/mol K), and T is the absolute temperature in K. When V and n are kept constant, we see that equation (1) gives a linear relationship 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 employed in this experiment is a device that uses piezoelectric crystals. Piezoelectric crystals produce an electric voltage across their faces when squeezed or stretched. By orienting a number of them cleverly inside the transducer, one can measure the applied gas pressure from the produced output voltage. Briefly stated, the pressure transducer outputs an
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