Best of Web – Yousef Shashtari

Best of Web – Yousef Shashtari

This video shows that we can return a mixed fluid to its original state. They used corn syrup and dropped 3 drops of food dye, the syrup is then mixed slowly in an orderly fashion. We can see how the drops of food dye are moving as if they were flowing in different layers. However, when reversing the rotation, food dye returns to its original state. This is happening due to the high viscosity of the corn syrup, which leads to a low Reynold’s number (laminar flow). Viscous liquids have high friction which allows us to revert a fluid to its initial form. Also, as the person keeps rotating the handle, we get new colors because of the mixed food dye.

Original Author: John DeMoss and Kevin Cahill of the University of New Mexico.

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1 Comment. Leave new

  • Luke Collier
    Jan 29, 2018 15:18

    3rd place! I was beyond surprised when I saw the drops of fluid return to their previous state. I hope it wasn’t a trick of video editing. I guess I shall see for myself!


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