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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > March  >
In the Laboratory
Quantifying Meniscus Forces with an Electronic Balance: Direct Measurement of Liquid Surface Tension. A Physical Chemistry Experiment
Rafael M. Digilov
Department of Education in Technology and Science, Technion-Israel Institute of Technology, 32000 Haifa, Israel
Cover
March 2002
Vol. 79 No. 3
p. 353
Abstract
The phenomenon of capillary adhesion, in which a drop of liquid placed between two solid surfaces attracts them together, is considered at an elementary level. It is shown that for a small amount of liquid, independent of the solids-contact geometry, the adhesion force is defined mainly by the Laplace pressure force FL, for which a generalized equation is derived under arbitrary contact geometry. A simple physical chemistry laboratory experiment for measuring FL between a glass sphere and a glass plate with an ordinary electronic balance is described. The relationship between FL and liquid surface tension g is used to obtain g. The validity and acceptability of this method for undergraduate physical chemistry laboratories is experimentally confirmed for various liquid samples.
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Instructions and laboratory notes for students are available.
*  Contents JCE2002p0353W.doc (Microsoft Word)
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*  Citation
 Digilov, Rafael M. J. Chem. Educ. 2002 79 353.
*  Keywords
 Laboratory Instruction; Liquids; Physical Chemistry; Surface Science
*  History
 Created:
Last Updated:		 January 31, 2002
March 16, 2005
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