Sciencelens

Today, 19 January, is Popcorn Day, a day to celebrate one of nature’s fun foods – those crazy little corn kernels that, when exposed to heat, explode violently and morph into cushiony white snacks many times their original size.

We’ve all enjoyed popcorn, but have you ever wondered what makes ’em pop?

The secret to popcorn’s popping ability lies in the composition of the kernel. The popcorn kernel consists of a hard, watertight outer shell, containing starch and a small amount of water and oil.

When the kernel is heated, the water inside tries to expand to steam, but the hard shell prevents this. The heat also gelatinizes the starch inside the shell. Once sufficient pressure has built up (to an incredible 930 kPa), the kernel bursts open in a violent explosion, freeing the steam and starch.

As the hot starch bursts out of the shell, it expands rapidly…

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