Popping Corn : March 06, 2008

Popping Corn
Image Data
File Name: 20D_16580
Model: Canon EOS 20D
Lens: Canon EF-S 17-85mm F4-F5.6 IS USM
Date: 03.05.08 11:24pm
Focal Length: 44mm (70mm)
Shutter: 1/200 s
F-Stop: F14
ISO: 200
Program: Manual
Metering Mode: Evaluative
Flash: On
Flash Details: Manual
Focus Mode: Manual focus

Popping Corn

Comments: 2   Views: 761   Like/Fave (12)   Studio
03.06.2008
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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 and a temperature of 356° F. 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.

Comments (0)

ami bradwell   03.06.08 6:13am  
Hey! I was gonna eat that!!
Mom   03.06.08 10:10pm  
Popcorn, my favorite - and this looks very tasty!

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