Popcorn

Popcorn (also called popped corn, popcorns, or pop-corn) is a variety of corn kernel which expands and puffs up when heated. The term also refers to the snack food produced by the expansion. It is one of the oldest snacks, with evidence of popcorn dating back thousands of years in the Americas. It is commonly eaten salted, buttered, sweetened, or with artificial flavorings.

A popcorn kernel's strong hull contains the seed's hard, starchy shell endosperm with 14–20% moisture, which turns to steam as the kernel is heated. Pressure from the steam continues to build until the hull ruptures, allowing the kernel to forcefully expand, to 20 to 50 times its original size, and then cool.

Some strains of corn (taxonomized as Zea mays) are cultivated specifically as popping corns. The Zea mays variety everta, a special kind of flint corn, is the most common of these. Popcorn is one of six major types of corn, which includes dent corn, flint corn, pod corn, flour corn, and sweet corn.

History

Corn was domesticated about 9,000 years ago, in what is now the Balsas River Valley of Central Mexico. Archaeologists discovered that people have known about popcorn for millennia. Fossil evidence from Peru suggests that corn was present there as early as 4,700 BCE, and popped there over 1,000 years ago. Between 2007 and 2011, evidence as early as 4,700 BCE for popping corn was discovered as macrofossil cobs at the Paredones and Huaca Prieta archaeological sites on the northern coast of Peru. Corn cultivation was present in Amazon basin farming practices as evidenced by cultivation of corn in the Amazon basin 6,000 years ago