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BYOE-Cold Boiling

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Conference

2017 ASEE Annual Conference & Exposition

Location

Columbus, Ohio

Publication Date

June 24, 2017

Start Date

June 24, 2017

End Date

June 28, 2017

Conference Session

Labs and Experiments

Tagged Division

Chemical Engineering

Page Count

10

DOI

10.18260/1-2--27992

Permanent URL

https://peer.asee.org/27992

Download Count

478

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Paper Authors

biography

Kristen Ann Thompson Loras College

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Dr. Kristen Thompson is currently an Associate Professor of Engineering at Loras College. She teaches Thermodynamics, Fluid Mechanics, Dynamics Systems, and Introductory Physics courses. She earned her Ph.D. from the University of Wisconsin - Madison and her B.S. from Michigan Technological University both in Chemical Engineering.

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Abstract

The goal of this experiment is to help students overcome misconceptions about the difference between heat and temperature. Specifically addressed is the misconception that a substance must be hot to boil. This experiment teaches that boiling requires heat but not necessarily be hot. The engineering application of this concept is fundamental to cooling systems.

One traditional experiment to determine the boiling temperature at a range of pressures instructs students to manipulate a small bubble within a tube. While this experiment does enable collection of accurate data, watching numbers change as data is collected lacks the impact to provide a memorable experience to change strongly held misconceptions.

In this experiment, students use a flask containing a liquid with a low boiling point and drop the pressure within the flask. The benefit of using this much larger quantity of liquid than the traditional experiment is that the student can hold the flask and use the sense of touch while the liquid is boiling at a range of temperatures including below 0°C. Using the sense of touch in addition to measuring the temperature and pressure electronically helps students reject the idea that a substance must be hot to boil and replacing this idea with the requirement that heat must be provided to the system for it to boil. In addition, the data gathered can be used with the Clausius-Clapeyron equation to determine the heat of vaporization as is the intent of the traditional experiment. Additionally, students locate the corresponding data in thermodynamic tables and plot the process on phase diagrams to improve understanding use of these tools.

Thompson, K. A. (2017, June), BYOE-Cold Boiling Paper presented at 2017 ASEE Annual Conference & Exposition, Columbus, Ohio. 10.18260/1-2--27992

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