X

This website uses cookies.

This website uses cookies to improve user experience. By using our website you consent to all cookies in accordance with our Cookie Policy.

I agree
Learn More
Cool Gadgets, Gizmos, Games and Geek Stuff on Technabob
VISIT OUR OTHER SITES: THE AWESOMER | 95OCTANE

Watch as Students Unmix Two Dyes in Liquid

by Conner Flynn
Advertisement

If you liked shows like Mr. Wizard as a kid, you’ll want to check out this neat video, which shows students from the University of Pennsylvania separating two colored fluids that have been mixed together and suspended in a highly viscous liquid. Basically, they just “rewind” the fluid.


It really is that simple. I thought it was a hoax the first time I watched it, but it turns out that both the experiment and the science behind it are very real. It is as amazing as it is simple. First they turn the crank and mix it up, then they simply reverse and both colors separate once again.

They accomplished this with a cylindrical container with a second smaller cylinder inside that is attached to a hand crank. The “Stokes Flow” is what makes this feat possible, named after George Gabriel Stokes. It’s a type of liquid flow that is defined by the battle between inertial forces and the viscosity of the fluids in question. In layman’s terms, the liquid used here is so thick that it halts the scatter that would normally happen if the dyes were placed in a thinner substance like plain water. So the dyes get mixed by momentum diffusion, instead of molecular diffusion, which makes the process reversible.

Pretty cool, no? Too bad we can’t rewind plain old water and get rid of pollution.

[via FYFD via Geek]

Deals in The Technabob Shop



PuckOpener Bottle Opener

PuckOpener Bottle Opener

Vinci 2.0 Smart Headphones

Vinci 2.0 Smart Headphones

The Magic of Mercury

The Magic of Mercury

Advertisement
Hennessey VelociRaptor 6×6 Is a Raptor with a Bonus Axle

Hennessey VelociRaptor 6×6 Is a Raptor with a Bonus Axle

2017 Lexus RC200t Review: A Corner-cutting Luxury Coupe

2017 Lexus RC200t Review: A Corner-cutting Luxury Coupe

RAESR Tachyon Speed EV Makes a Buttload of Torque

RAESR Tachyon Speed EV Makes a Buttload of Torque