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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.

The Chemistry of Popcorn - www.ChemistryIsLife.com

www.chemistryislife.com/t-3

There is water in the kernel of the popcorn and as the water heats up it expands into ... If it is below that number, the chances of the kernel popping decrease.

The Science of Popcorn | Carolina.com

www.carolina.com/teacher-resources/Interactive/the-science-of-popcorn/tr23952.tr

We offer top-notch chemistry supplies and AP® Chemistry products, backed by our ..... what is the ideal percentage of water in popcorn kernels for best popping.

The chemistry of popcorn: It's all about 'pop-ability' - Phys.org

phys.org/news/2005-04-chemistry-popcorn-pop-ability.html

Apr 14, 2005 ... Hamaker and his associates analyzed 14 different genetic varieties of yellow popcorn and compared their microwave popping performance.

The Science Behind How Popcorn Pops - Chemistry - About.com

chemistry.about.com/od/foodcookingchemistry/f/how-popcorn-pops.htm

Popcorn pops because each popcorn kernel is special. ... Learn the Science Behind Why Popcorn Pops · From Popping Over the Cave Fire to the Microwave  ...

Is popcorn popping a chemical or physical change? | Atom's World

www.middleschoolchemistry.com/atomsworld/2011/12/is-popcorn-popping-a-chemical-or-physical-change/

When popcorn “pops” is it a chemical or a physical change? ... For example, it is commonly noted that popped popcorn seems to have changed color, possibly ...

The Chemistry Of Popcorn: It's All About 'Pop-Ability' -- ScienceDaily

www.sciencedaily.com/releases/2005/04/050415112829.htm

Apr 15, 2005 ... Chemists at Purdue University have identified a key crystalline structure inside popcorn that appears to determine its popping quality.

Everyday Chemistry - How does popcorn pop?

humantouchofchemistry.com/how-does-popcorn-pop.htm

The sound of popcorn popping is almost as much fun as eating it. No wonder it is the most popular snack at movie halls and homes around the world. But what ...

Why Does Popcorn Pop? - Home Science Tools

www.hometrainingtools.com/a/popcorn-science-project

Does microwave popcorn pop a higher percentage of kernels than popcorn popped over the stove or in a popper? Predict what you think the result will be with ...

Popcorn Laboratory Problem: Popcorn kernels explode into ...

www.njacs.org/wp-content/docs/demobcce6.pdf

Cool the flask and mass its content after popping the kernels = ______ g. ( remove wire lid ... How does heating popcorn affect the pressure inside the popcorn ?