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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > June  >
Features
Tested Demonstrations
Relative Rates of Effusion through Punctured Balloons
William C. Deese
Louisiana Tech University, Ruston, LA 71272

Anna Marie Washburn
University of Arkansas, Fayetteville, AR 72701

Cover
June 1996
Vol. 73 No. 6
p. 539
Abstract
Numerous methods of demonstrating relative rates of gas diffusion have been successfully employed. From the diffusion of ammonia and hydrogen chloride through a narrow tube, to the passage of gases through a porous cup, these methods provide a vivid illustration of Graham's Law in both qualitative and quantitative fashions. Graham's Law also applies to gas effusion rates, which can be demonstrated by the passage of gases through a hypodermic needle into an evacuated flask. All of these demonstrations require either corrosive chemicals or access to a modest amount of glassware and equipment. A simple method of demonstrating relative rates of gaseous effusion which requires no corrosive chemicals or glassware is reported here.
More Information
*  Citation
 Deese, William; Washburn, Anna Marie. J. Chem. Educ. 1996 73 539.
*  Keywords
*  History
 Created:
Last Updated:		 9/23/1999
5/22/2006
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