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I think they are fluids that do not have a single flow rate but can vary depending on temperature etc
Cornflour mixed with water is another example: when you keep it moving it behaves like a solid, but if you stop, it behaves like a liquid and goes everywhere!Wikipedia has a good page on non newtonian liquids http://en.wikipedia.org/wiki/Non-Newtonian_fluid
It's a liquid that shows a non-proportional reaction to the forces acting on it - so with the cornflower/water mix, a larger force won't just make it squidge faster.
Newtonian fluidFrom Wikipedia, the free encyclopedia A Newtonian fluid (named after Isaac Newton) is a fluid whose stress versus strain rate curve is linear and passes through the origin. The constant of proportionality is known as the viscosity.
So if you handle it softly, it flows, but apply a large force and it locks up like a solid.