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Why is quicksand considered to be a non-Newtonian fluid?

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Quicksand is a shear-thinning suspension or non-Newtonian fluid. More details about quicksand are given here: Quicksand - Wikipedia. read more

These fluids have a linear relationship between viscosity and shear stress. Examples: Water; Mineral oil; Gasoline; Alcohol; NON-NEWTONIAN FLUIDS. You can probably guess that non-Newtonian fluids are the opposite of Newtonian fluids. When shear is applied to non-Newtonian fluids, the viscosity of the fluid changes. read more

Quicksand is a non-Newtonian fluid: when undisturbed, it often appears to be solid (“gel” form), but a minor (less than 1%) change in the stress on the quicksand will cause a sudden decrease in its viscosity (“sol” form). read more

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Non-Newtonian Fluids. - ppt video online download
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Further Research

Q & A: Non-Newtonian Fluids II
van.physics.illinois.edu