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Last updated: Wednesday, 24 June 2009 17:00 GMT
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In this high-speed, high-resolution video, freely falling granular streams behave similarly to water flowing from a faucet. These granular streams behave like dense, cold fluids with ultra-low surface tension (cohesion between individual molecules). 'These experimental results open up new territory for which there currently is no theoretical framework,' John Royer and his co-authors at the University of Chicago report in the journal Nature (c) John Royer
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Water forms droplets because attractive interactions between molecules produce surface tension. If macroscopic objects - say, grains of sand - replace the molecules, the relative strength of this attraction would dramatically drop. What vestiges of liquid behaviour remain in such ultra-low surface tension limit?... — full story
RELATED STORY:
Streaming sand grains help define essence of a liquid
— 24 Jun 2009 | PhysicsWater forms droplets because attractive interactions between molecules produce surface tension. If macroscopic objects - say, grains of sand - replace the molecules, the relative strength of this attraction would dramatically drop. What vestiges of liquid behaviour remain in such ultra-low surface tension limit?... — full story
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