Why does Popcorn have different shapes?
The water inside the corn is stored inside a circle of soft starch and this starch is surrounded by the hull. When the corn is heated and the water turns into steam, the starch changes into a really hot gelato like goop.
The kernel continues to heat up and finally, the hull explodes due to the pressure exerted by the steam, the starch, which has now become superhot and inflated, spills out of the kernel and cools immediately, forming the twisted shapes of popcorn that we see.
Did You Know 
The grains which are left at the bottom of the pan which couldn’t pop are known as ‘old maids.’ This corn was too dry to pop.
Post time: Apr-14-2022