The viscosity of non-Newtonian fluids changes under the influence of force. If ketchup rests for a certain period, it becomes thick. If you then exert force on it, it becomes thinner, the stronger and longer you stress it. Ketchup also has a so-called yield stress: you first have to apply a certain amount of force to get it to flow. If less force is applied, the ketchup remains solid in the bottle. If, on the other hand, too much force is used, a whole gush of ketchup comes out of the bottle at once.
But how do you get the ketchup out of the bottle without a big gush?
This material was created by KINDERFORSCHER AN DER TUHH and is licensed under CC BY-NC-SA 4.0 International.
Task:
Can you find other non-Newtonian fluids? Share the results of your research in the Community.
Can you find other non-Newtonian fluids? Share the results of your research in the Community.