Author Topic: POPCORN  (Read 1047 times)

lamay

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POPCORN
« on: April 08, 2008, 08:37:06 AM »
Popcorn or popping corn is a type of corn which explodes from the kernel and puffs up when heated. Special varieties are grown to give improved popping yield. Some wild types will pop, but the cultivated strain is Zea mays averta, which is a special kind of flint corn.


Each kernel of popcorn contains a certain amount of moisture and oil. Unlike most other grains, the outer hull of the popcorn kernel is both strong and impervious to moisture, and the starch inside consists almost entirely of a hard, dense type.

As the oil and the water are heated past the boiling point, they turn the moisture in the kernel into a superheated pressurized steam, contained within the moisture-proof hull. Under these conditions, the starch inside the kernel gelatinizes, softening and becoming pliable. The pressure continues to increase until the breaking point of the hull is reached: a pressure of about 135 psi (9.1 atm) and a temperature of 180°C. The hull ruptures rapidly, causing a sudden drop in pressure inside the kernel and a corresponding rapid expansion of the steam, which expands the starch and proteins of the endosperm into airy foam. As the foam rapidly cools, the starch and protein polymers set into the familiar crispy puff.

Popping results are sensitive to the rate at which the kernels are heated. If heated too quickly, the steam in the outer layers of the kernel can reach high pressures and rupture the hull before the starch in the center of the kernel can fully gelatinize, leading to partially popped kernels with hard centers. Heating too slowly leads to entirely unpopped kernels: the tip of the kernel, where it attached to the cob, is not entirely moisture-proof, and when heated slowly, the steam can leak out of the tip fast enough to keep the pressure from rising sufficiently to break the hull and cause the pop.

Kernel and popped popcorn
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dj paparazzi

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Re: POPCORN
« Reply #1 on: April 09, 2008, 07:21:47 AM »
kalami sa popcorn, bagay na bagay sa movie..
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janice

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Re: POPCORN
« Reply #2 on: April 09, 2008, 08:27:34 AM »
kalami sa popcorn, bagay na bagay sa movie..
bitaw makalingaw bitaw ni popcorn sa movie deejay noh?
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angeline

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Re: POPCORN
« Reply #3 on: April 10, 2008, 07:24:05 AM »

maubos ko talaga to ever, kahit ganito ka dami.. hehehe
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Re: POPCORN
« Reply #4 on: April 10, 2008, 11:31:54 PM »
pop rice lami pud! in other words, ampao!! ;D ;D ;D
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chinitAngel

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Re: POPCORN
« Reply #5 on: April 14, 2008, 06:44:16 AM »
sarap ang popcorn lalo na pag marami ang cheese! tas may soda sa tabi..  :D
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jomargatz

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Re: POPCORN
« Reply #6 on: May 09, 2008, 06:15:03 AM »
wow..ang sarap naman nyan. . .
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MichaelCorleone

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Re: POPCORN
« Reply #7 on: May 09, 2008, 06:15:59 AM »
marami ditong popcorn kaso  di ako mahilig

jomargatz

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Re: POPCORN
« Reply #8 on: May 10, 2008, 04:22:26 AM »
wow...pang sine. . .
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ryanjoe

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Re: POPCORN
« Reply #9 on: May 10, 2008, 05:43:32 AM »
for movie theater!!
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Re: POPCORN
« Reply #9 on: May 10, 2008, 05:43:32 AM »