Grainy Geyser: Tall squirts reveal sand's liquid ways
By Peter Weiss, 15:50 PM April 15, 2008
Loose sand can pack so strongly and densely that it can support a house, yet it can also flow easily, as in an hourglass. Physicists in the Netherlands have now accentuated the liquid behavior of granular materials by reducing the sizes of the particles and the forces between them. The result is a bizarre substance that ejects towering jets of grains when objects drop into it.
Granular materials play important roles in many natural and industrial processes, from the movements of sand dunes an...
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