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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > January  >
In the Classroom
JCE DigiDemos: Tested Demonstrations
Tears of Wine
Marcos Gugliotti
Instituto de Química, Universidade de São Paulo, Brazil

checked by Todd Silverstein
Department of Chemistry, Willamette University, Salem, OR 97301

Cover
January 2004
Vol. 81 No. 1
p. 67
Full Text
The motion of wine drops observed on the internal walls of a glass, usually called "tears of wine", is perhaps the oldest known example of surface tension driven flows. In 1855, James Thomson gave the first correct explanation of this phenomenon, considering the effect of surface tension. An attempt to describe the formation and flow of the "tears" taking into account the role of cohesive and adhesive forces but without any mention of surface tension was the subject of an article published in this Journal a few years ago (J. Chem. Educ. 1998, 75, 723). In the present work, it will be shown that cohesive and adhesive forces can only explain part of the phenomenon and that a more complete explanation should include the concept of surface tension gradient. For a better understanding of the effect, a simple experiment was performed to show the formation of the tears.
More Information
*  Citation
 Gugliotti, Marcos. J. Chem. Educ. 2004 81 67.
*  Keywords
 Aqueous Solution Chemistry; Demonstrations; General Chemistry; Introductory / High School Chemistry; Surface Science; Teaching / Learning Aids
*  History
 Created:
Last Updated:		 December 8, 2003
February 18, 2005
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