Place either beans, rice, or sand in a beaker. Heat them up and see how long they can hold their temperature doing the same experiment in heat transfers. I would expect for the solids to conduct heat slower, because convection happens in liquids and gases and pushes more vigorously against their surroundings (Tillery, Enger, & Ross, 2008). Therefore, the solid would stay hot longer.
Reference
Tillery, B. W., Enger, E. D., & Ross, F. C. (2008). Integrated science (4th ed.). New York: McGraw-Hill.
Interesting idea. Thanks for sharing. This quick lab could be done in class because the materials are cheap and readily available.
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