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If you combine cornstarch and water, it creates oobleck; a non-Newtonian fluid.
It acts like a solid when force is applied
but still behaves like a typical fluid and
can be poured like water. When you apply
enough force, it seems to
act and feel like a hard solid surface. As
soon as you stop applying pressure, time to
get sinking. That's right, you'll feel the
surface turn back to a liquid state and you'll
think you are in quick sand. Keep moving on
top or apply enough pressure and the surface
will remain hard.
You can
try this at home but you might not want to
fill a swimming pool.
Here is what you can do. Using a small bowl,
add some corn starch and water,
then pick up the gooey mess with your
fingers. If you keep it moving it around with your
hands and fingers, it will remain a solid
and you can jumble it around in your hands.
One you stop, it instantly turns back to
water and you'll have a big mess to wipe off
your hands!
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Above, a quick demonstration
of walking on a pool of water and corn
starch combined. |
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