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Week:  Changing shape through heating   Roald Tredoux Grade 2D

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Question: Why did the shape of the corn kernel change when heat was added?

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5 Burner Gas Stove for Sale - (139415810) | Opensooq

5 cooking oils that are healthier and more nutritious than butter and ghee  | The Times of India

Organic Popcorn Kernels - Forest Whole Foods

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Remember: Always ask an adult to help you when you work with                electricity, gas or fire.

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The popcorn  kernels are  heating up in the oil.

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Explanation: Inside each kernel of popcorn is a tiny drop of water surrounded by a hard shell called a hull. A drop of water is made up of tiny particles called atoms. When cold, these atoms are close together, but with heat, it becomes more active, so it needs more space to move around.

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This is what happens to the drop of water  inside the kernel. The green dots show the  particles  ( atoms) inside the drop of water:

12.2: Properties of Liquids and Solids - Chemistry LibreTexts

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Explanation continues: As the popcorn is heated, the water turns into steam. The atoms in steam needs extra space to move around (when heat is added), so it builds pressure inside the kernel. When the hull can no longer contain the pressure, the kernel pops.

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Explore the "POP" in popcorn - Scientific American

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Conclusion: As the kernel heats up, the water inside it expands, building pressure against the hard surface. As it explodes, the soft starch inside the popcorn becomes inflated and bursts. The steam inside the kernel is released, and the popcorn is popped, hot and ready to eat.

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