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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 variety of corn kernel, which explosively expands and puffs up when heated. .... A very different method of popcorn-making can still be seen on the streets of some Chinese cities and Korea today. ... Popcorn will pop when freshly harvested, but not well: its high moisture content leads to poor expansion and ...

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 ...

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

Here's a look at what makes popcorn different from other seeds and how ... If popcorn is heated too quickly, it will pop, but the center of each kernel will be hard ...

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.ask.com/youtube?q=What+Makes+Popcorn+Pop&v=Ws7FVKFxTK0
May 2, 2012 ... In this episode, you will find out what make popcorn explode! Thmbs up 4 EXPLOSIONS! New Website! http://mstudents.wix.com/recess-tyme.
www.ask.com/youtube?q=What+Makes+Popcorn+Pop&v=lTgBUe3HPCQ
Jan 2, 2015 ... What makes popcorn pop? That question is answered right here! New Random Factoid every Friday! So make sure to subscribe to learn more ...

www.amazon.com/What-Makes-Popcorn-Pop-Questions/dp/1563974029

How do fish breathe? Can bulls really see red? Did unicorns really exist? Why do wolves howl at the moon? Can you get to China by digging a hole? Here in ...