References
- 1Scientific American: Explore the "POP" in popcorn
scientificamerican.com
- 2University of Georgia Extension: To Pop or Not to Pop...
extension.uga.edu
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Popcorn is a tiny pressure cooker.
Popcorn looks like a snack, but each kernel is a tiny pressure vessel. Its hard outer shell traps water; when the kernel heats up, that water becomes steam and pressure builds inside. At about 180 °C, the shell ruptures, the starch expands, and the kernel turns itself inside out. The familiar pop comes mainly from the rapid release of vapor after the crack. 12
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