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Summary
DescriptionPoiseuille1.jpg
English: A conceptual illustration of the viscosity force. Two liquids are moving with different velocities generating a force. The movement is in the x direction and therefore the velocity gradient is Δvx/Δy
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Heptagon
Original upload log
The original description page was here. All following user names refer to en.wikipedia.