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Play with these balls... What are they? Particles. See upcoming film on the Hutchison Effect

Advanced reading:

Measurement of density, sound velocity, surface tension, and viscosity of freely suspended supercooled liquids

Journal	International Journal of Thermophysics
Publisher	Springer Netherlands
ISSN	0195-928X (Print) 1572-9567 (Online)
Issue	Volume 16, Number 2 / March, 1995
DOI	10.1007/BF01441920
Pages	545-555
Subject Collection	Physics and Astronomy
SpringerLink Date	Friday, April 22, 2005

Physics using Balloons:
http://www.physicsforums.com/archive/index.php/t-41611.html