The
most loving fun food ,while watching a movie is you
known ,is popcorn or we can say movie snack.It is so
simple and easy .
But have you ever thought how a kernel of corn becomes a popcorn?surprisingly ,its making is not so simple .It involves an intriguing combination of thermodynamics and fracture mechanics.
French investigators and engineers Emmanuel Vi rot and Alexandre Ponomarenko carried out experiments into what makes popcorn pop corn ,well, pop.
For this , Cameras recording 2,900 frames per second ,showed what happens when a kernel of corn struts its stuff.
When the temperature reached 100 degree Celsius, some of the moisture inside the corn started to turn into steam.As temperature rose to around 180 degree Celsius, pressure build to around 10 bar or ten times the atmosphere at the sea level.
Unable to withstand the stress, the outer shell broke open, causing a dramatic drop in pressure that forced the kernel's starchy innards to expand and protrude.
The first thing that emerge from the fractured shell is a limb shaped structure -a "leg" that comes into contact with the surface of the pan and starts to compress under the heat .Tensed , and then released ,the 'leg 'causes the corn to leap up- a height ranging from a few millimeters to centimeters and emit a ' pop' from the sudden release of water vapor.
A few millisecond later , the granules spewing from inside expand to form a spongy flake .
Evolution from fracture to flakes takes less than 90 milliseconds. The popcorn's leap results from an intriguing combination of thermodynamics and fracture mechanics ,rather than just the blast of pent-up gases.
POP CORN
.JPG)
But have you ever thought how a kernel of corn becomes a popcorn?surprisingly ,its making is not so simple .It involves an intriguing combination of thermodynamics and fracture mechanics.
French investigators and engineers Emmanuel Vi rot and Alexandre Ponomarenko carried out experiments into what makes popcorn pop corn ,well, pop.
For this , Cameras recording 2,900 frames per second ,showed what happens when a kernel of corn struts its stuff.
When the temperature reached 100 degree Celsius, some of the moisture inside the corn started to turn into steam.As temperature rose to around 180 degree Celsius, pressure build to around 10 bar or ten times the atmosphere at the sea level.
Unable to withstand the stress, the outer shell broke open, causing a dramatic drop in pressure that forced the kernel's starchy innards to expand and protrude.
The first thing that emerge from the fractured shell is a limb shaped structure -a "leg" that comes into contact with the surface of the pan and starts to compress under the heat .Tensed , and then released ,the 'leg 'causes the corn to leap up- a height ranging from a few millimeters to centimeters and emit a ' pop' from the sudden release of water vapor.
A few millisecond later , the granules spewing from inside expand to form a spongy flake .
Evolution from fracture to flakes takes less than 90 milliseconds. The popcorn's leap results from an intriguing combination of thermodynamics and fracture mechanics ,rather than just the blast of pent-up gases.
POP CORN
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