Bolehkah anda berjalan dan melakukan aktiviti lain seperti berbasikal di atas air? Jawapan yang untuk soalan yang senang bukan? Pastinya tidak. Anda pasti terkejut selepas menonton video ini.
Video yang kami dapati daripada Youtube ini menunjukkan begaimana fakta ini disangkal. Dengan kaedah Non-newton Fluid Pool, anda pasti terkejut apabila mendapati manusia boleh berjalan di atas air.
A viral video shows people in Kuala Lumpur, Malaysia, walking across the liquid. They dance, flipped, play soccer and ride a bike on it.
A substance called non-Newtonian fluid
makes all these actions possible. Specifically, the pool above is
filled with about 2,100 gallons of a cornstarch and water mixture known
as "oobleck" — a homage to Dr. Seuss' book, "Bartholomew and Oobleck."
Non-Newtonian
fluids act differently than other liquids, such as water. When
pressured by say, the weight of someone walking across it, these
substances become solids momentarily, according a paper published in the
journal Nature in 2012. This includes things like blood, ketchup, and toothpaste.
The oobleck gets these properties because of the cornstarch. In
general, starches don't dissolve in water. Instead, the particles curl
up and cling together to form very tiny non-squishy particles.
When pressure is applied (by a person's foot or a bike, for instance)
the cornstarch particles get pushed down on top of each other,
squeezing the water out from between them. The particles can actually
become so thickly jammed together that they form a solid, the
researchers found.
But the substance won't stay solid for long. Once energy stops being
transferred to the liquid (when a person lifts their foot), the
particles are no longer squeezed together. Water fills in gaps between
the particles, and the oobleck returns to a more liquid state.
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