The mixture of cornstarch and water, often
called Oobleck, is such a fun experiment! It's
also a demonstration of a non-Newtonian
The cornstarch and water mixture
forms a suspension: a mixture of two substances,
where one is divided and dispersed in the other.
In the case of Oobleck, it's the solid cornstarch
dispersed in liquid water.When you quickly strike
the Oobleck, you are forcing the long starch
molecules of cornstarch closer together. The
impact of this force traps the water between the
starch chains to form a semi-rigid structure. When
the pressure is released, the cornstarch flows
All fluids have a property known as
viscosity - the measurable thickness or resistance
to flow in a fluid. Honey and ketchup are liquids
that have a high resistance to flow. Water has a
low viscosity. Newton said that viscosity is a
function of temperature.So, if you heat honey, the
viscosity is less than that of cold honey.
Non-Newtonian fluids, like Oobleck, have a
viscosity that changes when pressure or stress is
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