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Turbulent Motion in Ethyl Acetate - Water System
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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.
Keywords (Audience):
High School / Introductory ChemistryKeywords (Domain):
DemonstrationsKeywords (Feature):
Overhead Projector DemonstrationsKeywords (Subject):
LiquidsCiting Articles
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This article has been cited by 7 ACS Journal articles (5 most recent appear below).
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Dancing Crystals: A Dramatic Illustration of Intermolecular Forces
Donald W. Mundell , James H. MaynardJournal of Chemical Education2007 84 (11), 1773Dancing Crystals: A Dramatic Illustration of Intermolecular Forces
Donald W. Mundell , James H. MaynardJournal of Chemical Education2007 84 (11), 1773Crystals of naphthalene form on the surface of an acetone solution and dance about in an animated fashion illustrating surface tension, crystallization, and intermolecular forces. Additional experiments reveal the properties of the solution. Flows within ...
Some Observations of Ben Franklin Related to the Stilling of Waves by Oil
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Marcos GugliottiJournal of Chemical Education2007 84 (6), 941While studying the calming effect of oil on water, Benjamin Franklin made other interesting observations and arrived at conclusions related to chemical concepts and phenomena unusual for scientists of that time. A careful analysis of Franklin's article on ...
Surface Tension Gradients Induced by Temperature: The Thermal Marangoni Effect
Marcos Gugliotti , Mauricio S. Baptista and Mario J. Politi , Todd P. Silverstein , Carl D. SlaterJournal of Chemical Education2004 81 (6), 824Surface Tension Gradients Induced by Temperature: The Thermal Marangoni Effect
Marcos Gugliotti , Mauricio S. Baptista and Mario J. Politi , Todd P. Silverstein , Carl D. SlaterJournal of Chemical Education2004 81 (6), 824This article presents a simple experiment to demonstrate the motion of liquids induced by surface tension gradients generated by local heating. Changes in temperature are produced by bringing a heat source (soldering iron) close to a thin liquid film in a ...
Tears of Wine
Marcos Gugliotti , Todd SilversteinJournal of Chemical Education2004 81 (1), 67Tears of Wine
Marcos Gugliotti , Todd SilversteinJournal of Chemical Education2004 81 (1), 67The 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.
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- Received: August 03, 2009
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