Question: How is popcorn able to pop?
About the article "Popcorn", section "Abstract".

Candidate passages:
Popcorn, also known as popping corn, is a type of corn (maize, "Zea mays var.
everta") that expands from the kernel and puffs up when heated.
Popcorn is able to pop because, like amaranth grain, sorghum, quinoa, and millet, its kernels have a hard moisture-sealed hull and a dense starchy interior.
Pressure builds inside the kernel, and a small explosion (or "pop") is the end result.
Some strains of corn are now cultivated specifically as popping corns.
There are various techniques for popping corn.
Along with prepackaged popcorn, which is generally intended to be prepared in a microwave oven, there are small home appliances for popping corn.
These methods require the use of minimally processed popping corn.
A larger-scale, commercial popcorn machine was invented by Charles Cretors in the late 19th century.
Unpopped popcorn is considered nonperishable and will last indefinitely if stored in ideal conditions.
Depending on how it is prepared and cooked, some consider popcorn to be a health food, while others caution against it for a variety of reasons.
Popcorn can also have non-food applications, ranging from holiday decorations to packaging materials.
This is a list of popcorn brands.
Popcorn also known as popping corn, is a type of corn (maize, "Zea mays var.
everta") that expands from the kernel and puffs up when heated.
Popcorn is able to pop because its kernels have a hard moisture-sealed hull and a dense starchy interior.
Pressure builds inside the kernel, and a small explosion (or "pop") is the end result.
Some strains of corn are now cultivated specifically as popping corns.
Microwave popcorn is a convenience food consisting of unpopped popcorn in an enhanced, sealed paper bag intended to be heated in a microwave oven.
In addition to the dried corn the bags typically contain solidified cooking oil, one or more seasonings (often salt), and natural or artificial flavorings or both.
With the many different flavors, there are many different providers. 
A popcorn maker (also called a popcorn popper) is a machine used to pop popcorn.
Since ancient times popcorn has been a popular snack food, produced through the explosive expansion of kernels of heated corn (maize).
Commercial large-scale popcorn machines were invented by Charles Cretors in the late 19th century.
Many types of small-scale home methods for popping corn also exist.
Commercial popcorn machines are commonly found in movie theaters and carnivals, producing popcorn in a pan of hot oil, which has approximately 45% of its calories derived from fat.
Hot air popcorn poppers appeared for home use in the late 1970s, which produce popcorn with only 5% of its calories derived from fat.
The majority of popcorn sold for home consumption is now packaged in a microwave popcorn bag for use in a microwave oven. 
"Lowdown Popcorn" is a funk instrumental recorded by James Brown.
It was the third hit single Brown recorded in 1969 that was inspired by the popular dance the Popcorn, preceded by the instrumental "The Popcorn" and the song "Mother Popcorn".
It charted #16 R&B and #41 Pop.
The original studio recording of "Lowdown Popcorn" was included on Brown's 1970 album "Sex Machine" with added reverb and overdubbed crowd noise to simulate a live performance. 
The Weaver Popcorn Company, based in Van Buren, Indiana, is one of the largest popcorn companies in the United States.
Founded in 1928 by Ira E. Weaver, whose family still controls the company, it develops, grows, processes, packages, and ships a variety of popcorn products for sale around the world.
Its customers include store chains around the world, as well as concessionaires, and international popcorn distributors.
In 2007, the Weaver Popcorn Company became the first company to remove diacetyl, a controversial butter flavoring, from its "Pop Weaver" microwave popcorn products.