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Code Number: 4B40.45
Demo Title: Infrared Radiation/Absorption
Condition: Good
Principle: Radiation and Absorption of Heat from Different Surfaces
Area of Study: Thermodynamics
Equipment: Postcard Liquid Crystals with half of the back side painted black and half painted silver, Infrared Heat Lamp or Hot Plate with aluminum top.
Procedure:
Heat the cards up by shining the heat lamp onto the front of the card until all of the color is gone from the card. This will happen quickly so don't overheat the card. Let the card cool and watch which side cools fastest.
You can also hold the card over a large heat source and see which side heats up fastest but this variation may be harder to observe as both sides heat up rapidly.
References:
- Eric A. Schiff, "A Radiant Heating Experiment and Analogy With Earth's Surface Temperature", TPT, Vol. 62, #1, Jan. 2024, p. 50.
- Dennis Fung, "The ‘Chocolate Experiment’ – A Demonstration of Radiation Absorption by Different Colored Surfaces", TPT, Vol. 53, #9, Dec. 2015, p. 545.
- Fred T. Pregger, "Shady Thoughts", TPT, Vol. 27, #9, Dec. 1989, p. 646.
- Dena G. Russell and Richard A. Bartels, "The Temperature of Various Surfaces Exposed to Solar Radiation: An Experiment", TPT, Vol. 27, #3, Mar. 1989, p. 179.
- H-180: "Absorption by Painted Surfaces", DICK and RAE Physics Demo Notebook.
- Charles Taylor, "Demonstration 1.14", The Art and Science of Lecture Demonstration, p. 30.
- "Give and Take", Exploratorium Science Snackbook, p. 52 - 56.
- Ron Hipschman, "Give and Take", Exploratorium Cookbook II, p. 125.1 - 125.4.
- Yaakov Kraftmakher, "1.18, Kirhhoff's Rule", Experiments and Demonstrations in Physics, ISBN 981-256-602-3, p. 68.