Why does Popcorn pop when heated sufficiently?

Answer 1

The gas laws are a set of laws that describe the relationship between gases' temperature, pressure, and volume. These laws can be used to explain how an increase in temperature increases the pressure inside of the unpopped kernel. This increase in pressure also generates steam. The steam then explodes out of the outer shell of the kernel. As the pressure fades, the volume expands causing any air bubbles in the popcorn to grow and the kernel to "pop".

Answer 2

There is water inside the grains, and when the grains are heated, the water boils. The boiling water creates so much pressure that the popcorn pops.

Answer 3

The heat causes internal gases [steam etc] to expand until the outer skin can no longer contain the pressure and it explodes

Answer 4

Each kernel has water in the middle. The heat causes the water to expand, basically turning the kernel inside out.

Answer 5

As popcorn is heated, the water content inside the hull of the kernel converts to steam, which tries to expand. This presser from the expanding steam ruptures the hull of the kernel.