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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > July  >
In the Classroom
"Experiment with a Candle" without a Candle
Dusan Krnel and Sasa A. Glazar
Faculty of Education, University of Ljubljana, Ljubljana, Slovenia
Cover
July 2001
Vol. 78 No. 7
p. 914
Abstract
In the popular experiment in which a burning candle in an airtight cylinder purports to demonstrate the percentage of oxygen in the air, the main reason for the change in volume is the expansion and contraction of gases because of warming up or cooling down, not because the oxygen is used for burning. To support this explanation we have devised two experiments, the results of which are similar to the classic experiment with a candle, although a candle is not used. The experiments demonstrate that burning cannot be the only reason for the reduction of volume of gases in the cylinder.
More Information
*  Citation
 Krnel, Dusan; Glazar, Sasa A. J. Chem. Educ. 2001 78 914.
*  Keywords
 CER Misconceptions; Gases; General Chemistry; Public Understanding; Textbooks
*  History
 Created:
Last Updated:		 June 6, 2001
April 14, 2005
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