Bubbles exhibit weird sandy behaviour: To investigate whether bubbles behave in a similar way, Rémi Lespiat and his colleagues at the University of Paris-East in France squirted nitrogen gas into a chamber of water and monitored the resulting bubbles' passage through a tube.
At low densities, the bubbles flowed. But when they filled 64 per cent of the tube, they jammed just like the grains (Physical Review Letters, DOI: 10.1103/PhysRevLett.106.148302). The result suggests there may be a universal rule that kicks in when objects fill 64 per cent of a space.
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