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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > September  >
In the Laboratory
A Diode-Laser-Based Automated Timing Interface for Rapid Measurement of Liquid Viscosity
R. Craig Urian and Lutfur R. Khundkar
Department of Chemistry, Northeastern University, Boston, MA 02115
Cover
September 1998
Vol. 75 No. 9
p. 1135
Abstract
We describe an exercise in experimental design suitable for the undergraduate laboratory, involving the construction of an automated timing interface for laminar liquid flow in glass. In many instructional physical chemistry laboratories, viscometry is introduced through measurements on polymer solutions using the principle of laminar flow. The design and construction of the interface are both part of the exercise. The digital timing scheme allows high relative precision even with very short (1s) flow times, making the use of smaller sample volumes feasible.
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*  Citation
 Urian, R. Craig; Khundkar, Lutfur R. J. Chem. Educ. 1998 75 1135.
*  Keywords
 physical chem, liquids, laboratory instruction, laboratory equipment, apparatus
*  History
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Last Updated:		 June 21, 1999
November 22, 2005
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