Non-Newtonian Fluid

physics · liquids · strange matter

Ketchup flows funny. Ketchup is thick and sticky in the bottle, but when you shake it hard, it becomes runnier and pours out easily. That's because the force of shaking makes its viscosity (thickness) change.

Viscosity changes with force. Most normal liquids like water stay equally thick no matter how hard you stir them. Non-Newtonian fluids are rebels that actually change their thickness when you apply force to them.

Everyday examples everywhere. Toothpaste, shampoo, paint, custard, and even your blood are all non-Newtonian fluids. Once you know what to look for, you'll spot these weird liquids all around your home.

Thickens under stress. Some non-Newtonian fluids get thicker when you push them hard, like certain paint formulas that stay on walls without dripping. Others get thinner when stressed, like ketchup.

Key to chemistry. Scientists study non-Newtonian fluids to invent better products and understand how liquids really behave in the real world.