When Flowing Grains Get Jam Packed

Using color-shifting cylinders as substitutes for sand grains or coal lumps, a Duke University-led team of physicists has pinpointed a critical density level where granular materials suddenly cease flowing like a liquid and instead congeal into a state of rigidity.

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<p><a href="http://www.physorg.com/news89314661.html">When Flowing Grains Get Jam Packed</a></p> <p>Using color-shifting cylinders as substitutes for sand grains or coal lumps, a Duke University-led team of physicists has pinpointed a critical density level where granular materials suddenly cease flowing like a liquid and instead congeal into a state of rigidity.</p>