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Session:
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Experiments for Introductory Labs
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Paper Type:
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Contributed
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Title:
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Improved Gay-Lussac Experiment Considering Added Volumes
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Meeting:
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2019 Summer Meeting: Provo, UT |
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Location:
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N/A |
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Date:
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Time:
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6:15PM
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Author:
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Joel D. Krehbiel, Hesston College
620-327-8310, joel.krehbiel@hesston.edu
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Co-Author(s):
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Nelson Kilmer
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Abstract:
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The typical Gay-Lussac experiment requires heating and cooling of a flask connected via small tubing to a pressure sensor. Extrapolation of pressure-temperature data provides a simple way to estimate absolute zero. However, with standard laboratory equipment, the estimates are typically off by 10-15 percent. This error is due to the assumption that the tubing and pressure sensor are at the same temperature as the flask. However, the tubing and pressure sensor are actually closer to room temperature. Thus, the system acts as two connected volumes at two different temperatures. Here we derive the theory for this system and show why many Gay-Lussac experiments provide estimates of absolute zero that are too low. We also provide two alternative ways to estimate absolute zero using the two-volume model. Student results using these methods provide significant reduction in error and provide an excellent learning experience for students in introductory physics or chemistry classes.
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Footnotes:
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None
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Presentation:
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ImprovedGay-LussacExperiment.pdf
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