Why do popcorns crack and bang when we roast them?

Maize grains are hard on the outside, but inside they are soft and slightly moist. When grains are heated, the water inside them also becomes hot. The water turns into a hot steam that is tightly sealed inside the grain. Finally, the pressure is so hard that the steam gets the hull to blow up. The hard-outer casing opens and rotates around the grain inside.

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