Within minutes, a teardrop-shaped kernel no larger than a pea can magically mushroom into a fluffy treat that's many times its original volume. The tasty secret: water. Each popcorn kernel contains a hard outer shell and a starchy inside surrounding a dab of water. When the kernels are heated to about 450 degrees Fahrenheit (232 degrees Celsius), the pocket of water turns into steam and expands within the tough casing. Like blowing up a balloon, as more and more steam forms, the pressure against the outer shell increases. When the shell can no longer contain the building pressure, it finally gives way with the classic pop. The kernel turns inside-out, revealing the softened starch that makes up the white spongy part of your favorite movie snack.
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The etymology of popcorn stems from the corn kernel's characteristic bounce when heated, along with its distinct "popping" sound.