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Video: How Popcorn Pops (in Super Slow Motion)
The team behind the forthcoming six-volume, 2,200-page tome Modernist Cuisine show us exactly what happens to a kernel of popcorn when it's heated—at 6,200 frames per second.
Since a popcorn kernel is about 15 percent water, heat turns that water into steam, creating pressure inside the hard, non-porous hull. Then, at about 135 psi, it explodes and the starchy endosperm unfolds (via the Modernist Cuisine blog).

Yasha Wallin commented about 12 hours ago
Yasha Wallin commented about 12 hours ago
linda.l.anderson commented about 15 hours ago