Episode 8: Goo!

Science off the Sphere

Astronaut and chemist Dr. Don Pettit does physics demos that are out of this world. Currently on board the International Space Station, Dr. Pettit presents fantastic physics that can only be demonstrated in micro-gravity.


Episode 8: Goo!

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Challenge Question: Don's cornstarch solution is a shear-thickening non-newtonian fluid. What would change if Don used a shear-thinning fluid such as ketchup?

Challenge Answer: The shear-thinning fluid would tend to spread out when disturbed instead of mound up. At the edges of the speaker, the shear thinning liquid would tend to pile up where the oscillations stop and mound up into a ring.

Challenge Winner: Pam Garrett, Los Alamos, MN