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What is corn?

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Corn is a tall annual cereal grass (Zea mays) that is widely grown for its large elongated ears of starchy seeds. The seeds, which are also known as corn, are used as food for humans and livestock and as a source of biofuel and can be processed into a wide range of useful chemicals.

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Why do corn kernels pop?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
The Editors of Encyclopaedia Britannica

A popcorn kernel has an extremely hard hull that surrounds a mass of moist starchy endosperm (the food of the embryo). When such a kernel is heated to about 400 °F (about 200 °C), the moisture in the starch turns into steam and builds up pressure until the kernel explodes inside out into an irregular white fluffy mass about 20 to 40 times the kernel’s original size. About 25 corn varieties are suitable for popcorn.

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