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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > September  >
In the Classroom
Overhead Projector Demonstrations
Turbulent Motion in Ethyl Acetate-Water System

Jamil Ahmad
Department of Chemistry, University of Botswana, Private Bag 0022, Gaborone, Botswana

Cover
September 2000
Vol. 77 No. 9
p. 1182
Abstract
An overhead projector demonstration is described in which 4 mL of ethyl acetate is added to 10 mL of water contained in a 10-cm diameter Petri dish. Within a minute or so of the addition, image of a turbulent motion appears on the screen, at first at a few centers that eventually organize themselves in a line. The image of the line of turbulence is quite striking and resembles a moving front of dancing flames. The phenomenon arises because as ethyl acetate evaporates from the region where it has spread in the form of a monolayer, fresh material gets transferred to take its place. Because of the viscosity effects, this transfer of the surface film causes movement in the bulk of the material as well, making the process visible.
More Information
*  Citation
 Ahmad, Jamil. J. Chem. Educ. 2000 77 1182.
*  Keywords
 Demonstrations; Introductory / High School Chemistry; Liquids; Solutions / Solvents; Surface Science; Teaching / Learning Aids
*  History
 Created:
Last Updated:		 August 29, 2000
June 22, 2005
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