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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > April  >
In the Classroom
JCE DigiDemos: Tested Demonstrations
Double-Diffusive Convection: A Simple Demonstration
Mario Markus
Max-Planck-Institut für Molekulare Physiologie, Postfach 500247, 44202 Dortmund, Germany

checked by Richard W. Schaeffer
Department of Chemistry, Kutztown University, Kutztown, PA 19530

Cover
April 2004
Vol. 81 No. 4
p. 526
Abstract
Double-diffusive convection can be demonstrated using a cup, a pipet, coffee-whitener, and (optionally) a microscope. At first, cells (0.1–1 mm each) are formed; then, hundreds of needlelike structures become visible to the naked eye. This observation is related to a large number of interesting phenomena, such as deposition of chemical sewage at the bottom of the sea, salt distribution in oceans, and pattern formation in alloys, stars, and magma. If the microscope can be connected to video equipment (preferably with image storage in a computer) then a quantitative analysis of the emergence time and the size of the cells can be performed and compared to existing predictions.

Featured on the Cover
More Information
*  Citation
 Markus, Mario. J. Chem. Educ. 2004 81 526.
*  Keywords
 Diffusion; Fourier Transform Techniques; Laboratory Computing / Interfacing; Micelles; Physical Chemistry
*  History
 Created:
Last Updated:		 April 15, 2004
February 23, 2005
Link to Cover added (April 2004).
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