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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > January  >
In the Classroom
Overhead Projector Demonstrations
Illustrating Poisson's Ratios with Paper Cutouts
D. J. Campbell and M. K. Querns
Department of Chemistry, Bradley University, Peoria, IL 61625-0208
Cover
January 2002
Vol. 79 No. 1
p. 76
Abstract
This paper describes the use of flat, flexible lattices for demonstrating positive and negative Poisson's ratios for solids. Poisson's ratios describe the contraction or expansion of solids perpendicular to the direction in which they are stretched. These paper lattices can be used on an overhead projector for demonstration to an entire class, or they can be constructed and studied by students on an individual basis.
Supplement
Templates for the flat paper lattices and building instructions for lattices constructed with LEGO bricks are available.
*  Contents JCE2002p0076W.doc (Microsoft Word) (The .pdf, .sit, and .zip files are all approximately 5.5 MB: please adjust your download expectations accordingly.)
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More Information
*  Citation
 Campbell, D. J.; Querns, M. K. J. Chem. Educ. 2002 79 76.
*  Keywords
 Demonstrations; General Chemistry; Materials Science; Molecular Properties / Structure
*  History
 Created:
Last Updated:		 December 3, 2001
April 21, 2005
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