Sidebar: More About Viscosity and the Movement of Liquids

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When viscous liquids flow over a surface they often form layers of different velocity called laminar flow. Check out this demonstration of laminar flow using a Couette cell. Be patient, it is worth the wait.

Isn’t it cool how the apparatus reverses and the droplets go back to looking like how they did when they were added.

Laminar flow might have been part of what was happening in our ketchup experiment.

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