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Why does popcorn pop when it is heated?

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wild rice — Poaceae Wild rice (*Zizania aquatica*).

Popcorn pops because of the unique physical structure of its kernels, which belong to the Poaceae family. Each kernel features an exceptionally hard hull that encloses a mass of moist, starchy endosperm.12

When the kernel is heated to approximately 400 °F (200 °C), the moisture contained within the starch converts into steam. This process generates significant internal pressure against the rigid hull. Eventually, the hull can no longer contain the force, causing the kernel to explode inside out. This expansion transforms the kernel into an irregular, white, fluffy mass that is 20 to 40 times its original size.12

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