College of Liberal Arts & Sciences
4B50.10 - Thermal Conductivity Demo - 4 Thermos Bottles
Information about the Dewar demo is attached to the rack stand. Basically there is a silvered and evacuated, a silvered and unevacuated, unsilvered and evacuated, and unsilvered and unevacuated dewars. This allows for different amounts of heat loss. Boiling water is added just before this is taken into the classroom and even then the starting temperatures will be in the 88 to 92 degree centigrade range. Temperature decline vs. time is then recorded for each flask.
- Thomas B. Greenslade Jr., "Apparatus Named After Our Academic Ancestors - VI", TPT, Vol. 62, #4, April 2024, p. 259.
- Rosaria Conti, Aurelio Agliolo Gallitto, Emilio Fiordilino, "Measurement of the Convective Heat-Transfer Coefficient", TPT, Vol. 52, #2, Feb. 2014, p. 109.
- Paul Hewitt,"Figuring Physics: Steep Well", TPT, Vol. 50, #1, Jan. 2012, p. 8.
- Roland Berger, "Some Interesting Thermodynamics of the Thermos Flask", TPT, Vol. 45, #5, May 2007, p. 270.
- Peter Drago, "Teaching with Spreadsheets: An Example from Heat Transfer", TPT, Vol. 31, #5, May 1993, p. 316.
- Michael A. Karls and James E. Scherschel, "Modeling Heat Flow in a Thermos", AJP, Vol. 71, #7, July 2003, p. 678.
- Feier and Anderson, "Hd- 3", A Demonstration Handbook for Physics.
Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.