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Each popcorn kernel contains a small amount of water stored in a circle of soft starch inside the hard outer casing. When heated to around 450° F, the moisture turns to steam, creating pressure within.
As the pressure builds, the casing eventually gives way, and the kernel explodes and pops, allowing the water to escape as steam and turning the kernel inside out.

en.wikipedia.org/wiki/Popcorn

Popcorn is a type of corn that expands from the kernel and puffs up when heated. When heated, pressure builds within the kernel, and a small explosion (or "pop") is the end ..... This can make it an attractive snack to people with dietary restrictions on the intake of calories, fat or sodium. For the sake of flavor, however , large ...

www.popcorn.org/Facts-Fun/What-Makes-Popcorn-Pop

What Makes Popcorn Pop? Half the fun of popcorn is watching it turn from a hard, little yellow seed into a white fluffy treat. Few foods take such a dramatic turn ...

www.popcorn.org/Facts-Fun/Our-Story

What Makes Popcorn Pop ... is naturally low in fat and calories, gluten-free, and non-GMO, which makes it a great fit ... Pop up a bowl and enjoy your time here.

wonderopolis.org/wonder/what-makes-popcorn-pop

And why doesn't all corn pop when heated? The answer is a matter of simple science. Popcorn is a special kind of corn. Of all the types of corn, popcorn is the  ...

www.thoughtco.com/how-does-popcorn-pop-607429

May 5, 2017 ... Here's a look at what makes popcorn different from other seeds and ... If popcorn is heated too slowly, it won't pop because steam leaks out of ...

www.thespruce.com/why-does-popcorn-pop-1328691

Mar 18, 2017 ... We may not have always known what makes popcorn pop, but humans have been enjoying popcorn for thousands of years. Ancients attributed ...

www.latimes.com/science/sciencenow/la-sci-sn-popcorn-science-20150210-story.html

Feb 11, 2015 ... Here's why popcorn explodes, jumps and makes the popping sound. ... Uncovering the physics of popcorn -- what makes it pop, what makes it ...

www.asabe.org/media/115824/popcorn.pdf

The amount of moisture in popcorn determines how well it pops. Make a guess: Will it pop better if it's pretty moist? Pretty dry? Or somewhere in between?

thescienceexplorer.com/nature/what-makes-popcorn-pop

Jan 15, 2016 ... If just the smell of popcorn makes my mouth water, make sure that you have a bowl nearby when you watch this YouTube video of popcorn ...